Disclaimer: I do not own any of the material appearing in this story.

BGM: Mushroom Kingdom – Peach's Castle (Super Mario Odyssey)

Peach walked along the castle, humming to herself. It was another glorious day in the Mushroom Kingdom and the fact that she got the royalty from Ylisse, Hoshido and Nohr to be great powerful allies for the Mushroom Kingdom via a party. It was the best idea she had, and it's now it's not just Hyrule, Sarasaland, the Beanbean Kingdom, and Beacon.

She sighed happily, for she was also happy that Bowser didn't stop by and ruined things, though she did have to admit… he's been awfully quiet after stuffing her inside a painting and taking over her castle. Normally, she'd be worried that Bowser is planning something huge, but right now, she could care less.

"Princess!" A voice snapped her out of her thoughts as she turned to see a Toad Guard running over to her.

"What is it?"

"Someone is here to see you, she wishes to speak with you."

"She?" Peach wondered as she walked to the front doors to see a young woman looking at a mural on a wall, but she wasn't alone. There were two other girls and a boy with her as well. "Oh!" Peach exclaimed, snapping the woman away from looking at the mural. "Princess Anthiese, it's good to see you again!"

"You too, Princess. But please, call me Celica." She said.

"Man, you weren't kidding when you said that she knew you." The pink haired girl said.

Celica smiled. "Ever since Master Hand manipulated time and space and brought us here, the first one I've met was Peach. She gave me a tour of the Mushroom Kingdom… and I was wanting to bring you guys here. But every time I thought about it, Bowser kidnapped you." She frowned. "Since he's being quiet, I thought it was a good time as any to use this opportunity to come and meet you."

Peach smiled. "It sure was! So tell me, who are your friends?"

Celica turned to the gang. "This is Mae-"

"Sup?" Mae put her hands behind her head casually.

"Boey-"

"Hey."

"And Genny."

"Hello!" Genny waved.

Celica turned to Peach. "I was going to bring Alm and his friends over, but… unfortunately, they had a commitment."

Pause BGM

With the gang…

"For crying out loud, how do you do that so easily?!" Tobin asked, watching Link pull up fish left and right with his fishing pole.

"He's just gifted." Gray said, and then Alm pulled in a big one.

"Oooh, nice!" Alm said.

"I would not consider doing something so barbaric!" Clair protested. "…I don't want to touch some slimy fish." She shuddered.

"Grrr… WILL YOU GET ON THIS DAMNED HOOK?!" Tobin yelled.

"Tobin, maybe if you shut up for once, you'll get it. Besides, your yelling is scaring the fish." Gray said.

"Hmph!" Tobin growled… and then got a bite. "Oooh, what do we have here?" He asked and pulled it out of the water.

"…Karp?"

"That's the ugliest looking fish I've ever seen. Oh well!" He said with a grin, but Magikarp didn't take kindly to it as he proceeded to slap him to the ground with his tail and then swam off. "OH COME ON!"

"…Or angering the fish." Gray said with a sweatdrop.

"Yah!" Link pulled out some more fish with his fishing pole.

"Let's go on a fishing trip with Link, they said… it'll be fun, they said." Tobin grumbled.

"Shut up, Tobin." Gray said.

Back at Peach's Castle…

Resume BGM

"Oh, that's a shame." Peach said. "So, what did you want to talk about?"

"We heard that you made some powerful allies and Celica was wondering if we'd like to join you on that list." Boey said.

"Hmm… I think your kingdom was turned into Ylisse if I'm not mistaken." Peach said. "So technically, you already are."

"Eh?!"

"…I think that's what Zelda told me." Peach mused.

"Well, that would explain why the castle looked different when I went over there." Celica mused. "Alm seemed to be okay with it, though he did seem a bit saddened that our kingdom no longer exists."

"Your kingdom is with you in your hearts." Peach said. "Maybe one day, you can rebuild!"

"But where would be a good place to rebuild Zofia?" Celica wondered.

"Maybe we can share a kingdom?" Genny suggested.

"I'm not sure how that'll work." Mae said.

"You'll think of something." Peach giggled. "So, do you want some tea?"

"I'd love some." Celica said as the other three nodded.

End BGM

Meanwhile… with Luigi…

BGM: Toad Town (Mario and Luigi: Bowser's Inside Story)

Luigi hummed to himself, casually walking through the streets and having a good time as he waved at some of the residents and kept walking.

"Heeeeeey! Luigi!" A voice called out as Luigi turned to see Elise running up to her.

"Oh, hi Elise. What's up?"

"Oh, nothing much. I thought I'd stick around Toad Town for a bit with my retainers! …Though I don't have anything to do at the moment. Mind if I walk with you?"

Luigi nodded. "Sure."

"Great!" Elise smiled as they walked around. "So, anything you do for fun while walking around town… besides clean pipes?"

"Not really. I just usually get some fresh air." He said.

"Ah, cool!" She said as the two walked and chatted things up while waving at the residents. And as they kept walking, they came across an alleyway that they walked past… but heard something as they backed up.

End BGM

"Did you hear that?" Elise asked.

"I did."

Elise grabbed his arm. "Come on, let's go investigate!"

"I'm not sure that's a good ide-WHOA!" Luigi was pulled against his will from the Nohrian princess as the two went into the dark alley, until Elise let go of Luigi as they looked around the dark alley… and then heard groaning. "Wh-what was that?!"

"I dunno…" Elise got in a karate position. "But I'm ready to throw down!"

Luigi sweatdropped and got in a position himself, but unlike the really confident Elise… he was shaking in his boots… and then it got closer… and closer… until a Shuppet emerged from the shadows, and it looked extremely beat up… and it then passed out.

"Shup… Shup… pet…"

Elise gasped. "Oh my goodness, it's hurt!"

Luigi, without even hesitating, picked up the Shuppet and cradled it in its arms. "We need to take it to a doctor."

"I do heal people with my staff." Elise reminded. "Oh! We can take it your house and heal him up!"

"Good idea." He nodded as they took off toward the Mario Bros house, where they placed it on the couch and Elise began healing it up.

"Oh, I wonder who could've done this…" Elise wondered as Luigi also looked worried for the Shuppet. "…Say, aren't you afraid of Ghosts? I recall that I heard that this Shuppet is a Ghost type." She said.

"It is… but right now, I'm more worried about its health."

Elise smiled. "That's all I needed to hear!" She said… before putting a bandage around the Shuppet's head since she had noticed a small bump on its forehead.

"Shup…?" The Shuppet opened its eyes to see Luigi and Elise looking at it.

"Hey little guy!" Elise said in a soft whisper. "You're all better!"

"Are you alright?" Luigi asked in worry as the Shuppet nodded, and took one look at Luigi and smiled.

"Shup!" It smiled, floating above Luigi's head and nuzzling Luigi's neck with a smile. "Shup! Shuppet!"

Luigi chuckled. "You're welcome." He said… but to his surprise, the Shuppet wouldn't leave him alone, in fact, it made its home inside Luigi's hat and peeked out.

"Shup!"

"He likes you!" Elise giggled. "…Oh! We need to think of a name for him!"

"We?"

"Hmm…" Elise rubbed her cheek in thought and then pounded her fist into her palm. "I got it! I recall meeting a Misdreavus while coming into the Mushroom Kingdom, and it was really affectionate towards me, so I nicknamed it Affection! Though… it did run off as soon as we entered the Kingdom. So, why not nickname the Shuppet "Affectio"? It's Latin… for… Affection…" She blinked, seeming to have a troubled look.

"What's wrong?"

"I don't know why, but I'm having the strangest sense of déjà vu. I feel like we've already had this discussion." Elise said before shrugging it off. "Ah, I probably dreamed it up or something."

Luigi chuckled. "Affectio, huh?" He asked.

"Shup!" The Shuppet smiled, really liking the nickname.

"He likes it! Affectio it is!" Elise smiled… and then the door opened to reveal Mario.

"Whew, that was quite the fix." He said, having a box and a plunger in his hands. "Oh hey, what's all this?"

"We saw this Shuppet in a dark alley and it was all beat up. We nursed it back to health and he's already taking a liking to Luigi." Elise smiled.

"And he's not leaving my head." Luigi sighed.

Mario laughed. "That's actually cute!" He said… and then the door knocked as Mario went to answer it to reveal Parakarry.

"Sorry, I forgot to put this in the mailbox earlier." Parakarry said. "I'm so sorry!"

"Oh, don't be." Mario smiled as he took it from Parakarry as he saluted and then flew off, as he then read to who it was addressed. "Oh, it's for you, Luigi!"

"Oh?" Luigi took it and then opened up the letter, pulling out a piece of paper and reading it.

"Congratulations, you have won our once in a lifetime contest! You have won a beautiful mansion in the deep dark woods! Just stop on by and we'll give you the grand tour! And once again, congratulations!"

"Ooooh! You've won a contest! Congratulations!" Elise smiled.

"…That's strange…" Luigi quietly said. "I never even entered a contest."

"You haven't?" Mario asked, already sounding suspicious as he took a look at it, noticing that there was a map on the letter, and then saw words near the map that Luigi likely didn't even see.

"Totally not haunted nor a trap!" It said.

This made Mario more suspicious. He narrowed his eyes, something was definitely off about this… and the fact that Luigi mentioned that he didn't even enter a contest about a mansion made him really suspicious. He didn't like this one bit.

"I think it's cool that you won a mansion from a contest that you never entered!" Elise smiled. "Maybe your subconscious did it for you!"

"You think I would've heard about it on the news or something." Luigi said. "Still, I'm both a bit freaked out and amazed. I kinda want to check this out myself."

In his gut, Mario wouldn't allow this. He knew something was amiss and he felt someone out there wanted to do away with his little brother. Not on his watch.

"Hey bro. How about I go on ahead and I'll meet you up there?" Mario suggested. "That way I can check it out and once you meet up with me, I'll congratulate you on the mansion!"

"Hmm, alright." Luigi nodded, as he noticed there was something different in Mario's tone, but he didn't pay it much mind.

"See you later." Mario said, going for a bro hug as Luigi hugged him… but as Luigi tried to break apart, Mario still held on to him for about a minute before he let go, saluting at him before taking off.

"Well, that was weird." Luigi said.

"Oh, it's just bros being bros." Elise said and turned around. "You two have fun! I'm gonna go check on Effie and Arthur!" She said and then walked off.

"See ya." Luigi said and then turned to Affectio. "So… what do you do for fun?"

"Shup!"

With Mario…

Mario didn't like showing it when Luigi was around, but he was mad. He wasn't liking this at all and he wanted to get to the bottom of this, and then he took out his phone and contacted some people, and about a few minutes later, RWBY popped out of the Warp Pipe.

"Yo, what's up?" Yang asked.

"I need your help with something."

"The great Super Mario needs our help? That's something you don't hear every day." Weiss said before immediately sounding worried. "…What's wrong?"

"This." Mario gave them the letter.

"Oooh, you won a mansion!" Ruby grinned.

"No, my brother did, and he said he's never entered a contest." Mario explained.

"Wait, Luigi won a mansion in a contest that he's never entered?" Blake asked. "That doesn't make sense."

"I know. This doesn't add up." Mario said. "I don't show this around my brother often, but I worry about him at times. And I'm worried that someone is setting him up to be killed."

"Bowser?" Ruby asked.

"No, I don't think Bowser would do something like that." Yang said. "He'd go for more of the direct approach."

"Right." Blake nodded.

"I need your help." Mario said. "I don't know what's going on… but I'm not liking this." He said. "But I'm not doing this alone either."

Ruby brought out Crescent Rose and activated her Rose Palm. "Well, what are we waiting for? Let's take a look at this so-called mansion!"

"Yeah!" Yang nodded as Mario took the lead, and then hit a ? block to grab himself a Fire Flower as they took off, with Mario holding the map in his hands.

Eventually…

BGM: Mansion (Exterior) (Luigi's Mansion)

"Huh, it's night already." Weiss said as they wandered through the forest… and then Mario stopped dead in his tracks as he looked on to see a creepily haunted mansion in front of them, complete with flashing lightning!

"Well, that's not totally ominous." Blake said.

"Let's-a go." Mario said as they walked toward the mansion, ready for whatever would be thrown at them, and also dropping the map that the wind picked up and carried it off in the opposite direction.

"Hello?" Ruby called out as they opened the doors and walked through… and then the doors suddenly closed.

BGM: Right Behind You (Team Fortress 2)

"Wah!" Weiss exclaimed, jumping and pointing Myrtenaster as the door. "Did that just close on its own?!"

"Stay on your guard." Mario said as they nodded and looked around, ready to pound anything that came in their way, as they went through a door and entered the hallway.

"Ahahaha… you fools were unwise into coming here!"

"Who said that?!" Ruby asked as she aimed Crescent Rose through a hallway, but there was nothing.

"Ugh… who's breathing down my neck?" Weiss asked as she turned around… but there was nothing to be seen as they cautiously went through the hallways, not noticing a dark figure that went through a hallway. Blake turned around, but there was nothing to be seen.

"Okay, this is giving me the creeps." Yang said, cocking her gauntlets… and then the candle lights disappeared, making it darker than it was.

"Don't worry, I got this!" Mario said, lobbing fireballs at the candles… and then the small flames illuminated something in front of them, as they could barely make out dark purple sinister eyes.

"Welcome, you fools… to your doom!"

"Ack!" Ruby yelped.

"Quick! Light him up!" Yang said as they quickly shot at the mysterious figure, but he wasn't fazed at all… and then it shot something at the gang, making them drop their weapons and some certain items from Mario as they were launched to a wall.

"Ehehehehe! If this won't bring that scaredy cat to me, NOTHING will!" The figure cackled before an orange ghost came by and blew out the candles, turning the room dark once again.

End BGM

Back in the Mushroom Kingdom…

"Huh?" Peach asked in surprise. "Luigi won a mansion and Mario and RWBY went to investigate?"

"That's what I heard!" Captain Toad said.

"Hmm…" Peach rubbed her chin in thought, having a bad feeling about this. "Go find them… I'm suddenly having a bad feeling about this."

"Right! I'll go gather up the brigade!" He said and took off, while Celica and the others looked worried.

With Luigi…

BGM: More Gun (Team Fortress 2)

"Hmm…" Luigi paced around Toad Town. "Mario should've called me saying he was there." He said.

"Who was where?" A voice asked as he turned to see JNPR and Booniper coming up to them, as Luigi explained what happened.

"Ooooh, you won a mansion from a contest you never entered? Neat!" Nora grinned, unaware of she said it within ear shot of a certain dark mage.

Really… a mansion? Tharja thought with intrigue. "Hmm…" She mused and went off somewhere.

"That's… suspicious." Pyrrha said.

"Indeed. Something is not right." Ren said.

"Oh come on, how bad can it be?" Jaune asked… and then they noticed something flying in the air as it landed in Luigi's arms.

"This is the map that Mario took with him." Luigi said, and frowned. "Wait… what happened to Mario?"

"Shup?" Affectio popped out of Luigi's hat, looking at the map in curiosity.

"Oh! What is that?!" Pyrrha asked in surprise.

"Shup!" Affectio smiled at her, before noticing Booniper as he flew over to him in curiosity, as the Boo chattered a little as the two floated around a bit.

Luigi felt something was wrong… he didn't know what it was, but it felt like he needed to go see if his brother was alright.

"Hey, we'll go with you." Ren said. "It's not like anything bad happened to Mario, right?"

"Yeah, and not like RWBY went with him!" Nora said.

"Excuse me." A voice said as they turned to see Celica, who said goodbye to Peach and had overheard the conversation. "I couldn't help but overhear you said Mario and RWBY."

"We did." Luigi nodded and explained what happened.

"Huh, that's interesting!" Genny said. "A Toad said he overheard Mario and RWBY going to check on some mansion and they never came back, so he and some Toad Brigade were going to go check it out."

"Oh… never mind then." Nora said.

"Well, I do have this map. I'm gonna go check it out." Luigi said.

"We're going too!" Jaune said.

"Mind if we go with you?" Celica asked. "Sorry, I didn't get your names." She said and with one long introduction, Celica nodded.

"Alright, let's go check out this mansion!" Mae cheered.

"…Here's hoping it's not haunted…" Boey said, and then finally noticed Affectio and Booniper, as he paled up and screamed, hiding behind Mae.

"You are such a little girl sometimes..." Mae sighed.

"Am not!"

"Let's go." Luigi said as they nodded and took off, unaware of Tharja peeking out from a corner… and with Morgan and Noire.

"I want you two to go accompany them to that mansion." Tharja said.

"Need all the help they can get?" Morgan asked.

"That and mansions hold valuable things. Here's a bag if you find anything valuable for our house."

"Why can't you do it?" Noire asked.

"I could, but I'm going on a date with your father… and he doesn't know it yet!" She smirked devilishly with a sadistic chuckle.

"Oh, I like the way you think, mother!" Morgan chuckled darkly. "Alright, we'll be off!"

"You two have fun." Tharja said as Morgan and Noire went off.

"Hey guys, wait up! We're coming with you!" Morgan waved toward them as they turned to them.

"Oh well, hey, the more the merrier!" Luigi grinned as they nodded, and then they took off… unaware of what horrors were waiting for them.

Mwahahahaha! Welcome to another spooktacular- *looks at the date* ...Eh, still counts. Welcome to another spooktacular story of the RWBY series! Luigi's Mansion... but with JNPR! ...And Celica and her friends and Morgan and Noire... and Affectio and Booniper, but whatever!

What horrors await the gang? Wait and find out!

...Okay seriously, was anyone expecting the original game to get ported to the 3DS, of all things?