Chapter 1: Basara and Star

(Opening A/N: This is going to be a total Star Vs The Forces Of Evil/Testament Of Sister New Devil crossover, after moving to California with his new family, Basara Tojo has adapted to his new life until a princess from the Planet Mewni comes and turns his world upside down, now with multiple girls staying with the lucky bachelor, as he teaches the young princess about Earth life, but thanks to her magic, she's going to teach Basara all about what it means to become a rebel princess. This story is rated M for blood and gore, strong graphic violence, adult language, lots of nudity, and for lemons as well, as for the disclaimer, I don't own Star Vs The Forces Of Evil for that is owned by Disney XD along with Daron Nefcy for she is the creator of that awesome show, as for the Testament Of Sister New Devil is owned by Nitroplus, Tetsuto Uesu, Nekosuke Ōkuma, and Crunchyroll, so without further ado, here's chapter 1.)

[Echo Creek California, restaurant…]

Basara Tojo was a former hero who left his village due to an incident and a friend of his got killed, both he and his dad came to the United States since he was going to be an older brother to two younger sisters along with his dad getting remarried.

"So tell me Basara, do you ever want little sisters?" Jin asked, Jin happens to be Basara's father, and he too happens to be a hero as well.

"Yeah I mean I've always wanted to be an older brother, but for now I need to go to the can." Basara said as he headed for the bathroom but little did he know that there was someone occupying the bathroom, which happened to be a really beautiful girl by the name of Mio Naruse, she was pulling down her panties trying to use the toilet, but she was barged in by Basara who didn't have the decency to knock first, and there was a note on the door…

Notice: Due to the door's lock being broken, please make sure you knock on the door before entering.

-Management

Basara tweaked when he saw the sign on the door, and Mio was about to scream that she was having Basara join her in the bathroom, so he placed his hand over her mouth to prevent the girl from screaming.

"Look I'm sorry I walked in on you, but I just want you to know, that I'm looking for my little sister, she's supposed to be here." Basara said, and another girl saw Basara and Mio in the bathroom at the same time.

"Ahem, what is the meaning of this you pervert?!" Asked the other girl, her name is Maria, and she is a succubus.

"I see that your little sisters have finally made it." Jin said, as he joined the girls as they all went out of the restroom and it seemed that Mio was still mad at Basara for barging into the bathroom on her.

[Meanwhile on the planet of Mewni…]

A teenage girl who happens to be a princess by the name of Star Butterfly was getting a magic wand from her mother, the queen of Mewni.

"Now Star, I'm trusting you with this wand, but you need to be careful with this wand, you could destroy the universe." The queen warned her daughter, but without thinking twice, Star tried to use her magic for the first time.

"Oh don't worry mom, I'll be careful." Star said innocently, but it turned out that she couldn't be able to use her magic properly, and thus, she caused so much panic and chaos with the kingdom as she summoned a flaming rainbow over the kingdom and the people began to run and scream in fear, so her parents, the king and queen needed to send her where she could be able do magic without causing any harm to the people of Mewni.

"Star, I'm afraid that we're going to send you away from here, somewhere you won't be able to hurt anyone." Queen Moon said, and Star just tweaked out when she knew that her parents might send her to Saint Olga's Reform School For Wayward Princesses, and Star freaks out at that idea.

"No, no, no, no, no, no! Not St.O's, anywhere but there." Star begged since she didn't want to be a part of that school.

"No, no, no, dear, it's somewhere better than that, we're going to send you to Earth, hopefully you can learn how to manage your magic there." said the Queen as she and the king both pack up Star's things and send her to earth.

Just then, as soon as Jin, Basara, Mio, and Maria were all moved into their new house, it turned out that they were also having some company as well.

A portal then opens up as the royal family of Mewni arrived, Jin saw that there was another teenage girl with the two adults.

"Excuse me, I was wondering if you could be able to take care of our daughter for the time being?" asked the Queen, and Jin looked at the young princess and he knew that he could always use another girl to spruce up the home.

"Well I don't see what harm could come when another girl decides to join our family, come, we're about to a family picture together, and you're more than welcome to join us." Jin offered, and both the king and queen decided to show some hospitality by joining in on the photo-op.

When everybody was in place, Jin pressed the timer on the camera as he joined in the photo as it counted down snapping a picture.

As soon as the picture was taken, the king and queen then headed back through the portal, but not before saying goodbye to Star.

"Now star, promise me that you will be a good little girl while you're here on Earth, otherwise we might have to send you to Saint Olga's." Queen Moon said and it made Star panic a little.

"Anywhere but St. O's." Star squealed, she really didn't want to go to that school.

"Just promise us you'd stay out of trouble." Queen Moon stated and Star nodded she knew that she wanted to stay out of St. O's.

"I promise Mama." Star said, as she had both of her parents went through the portal back to Mewni.

As soon as Star's parents left, Jin had some work to do as well and he needed to leave home.

"Basara, I need you to be the man of the house while I'm gone." Jin said as Basara knew that he needed to take care of his sisters along with the Mewni princess.

"You can count on me dad." Basara promised, Jin then got into the taxi that was waiting for him and left the house.

[Later that night…]

Mio and Maria then began to work a spell, and Basara along with Star just saw what the spell was.

"What are you guys doing?" Basara asked, asked Maria then tried to use a spell to make both Star and Basara leave.

"Leave this house." Maria said, but it had no effect on him, he held Star's wrist for support, and it turned out that Maria's magic was no use. "Why isn't my magic working?" She asked and it seemed that Basara negated her magic since he happens to be no ordinary human, he was a hero.

"I happen to be a hero, even though my dad and I left the clan." Basara said, and there was a reason why he left the clan with his dad.

Just then a bunch of lesser demons were lying in wait, so Basara and the others decided to make the first move.

"Mega rainbow blender turbo punch!" Star said as she casted a spell and summoned a giant blender with tail pipes as it blended a rainbow and shot out a giant boxing glove into the first lesser demon and Basara used his hero blade to cut it down. "Whoa, better not let him know about my ex boyfriend Tom." Star muttered to herself.

Maria also used her magic to slice up some of the other demons as well, but it seems that the only person not able to do magic is Mio.

As soon as all the demons were dealt with, it turned out that they were sent by Star's arch nemesis, Ludo.

"Damn those lesser demons, looks like I'm going to have to use another method." Ludo plotted, and it seemed that someone gave him lesser demons to deal with Star and group.

[The next morning…]

Star decided to see if Basara was awake, so she climbed on top of Basara…

"Basaraaa, time to wake up." Star sang, but little did she know, that there was something between her and Basara, so Star grabbed the item knowing that it wasn't him personally and it felt like a plastic cover for something, she then pulled down the blanket and saw some eroge games along with some hentai showing some younger step sister love.

"Eww, I never pegged you for that kind of person." Star muttered as she saw it, but it was a "gift" from Maria.

"Uh Star, what are you doing in my room?" Basara asked as it turned out he was completely naked.

Star noticed as she began to blush, this was the first time she saw a boy completely nude.

"I, uh, came to wake you up and let you know that school is about to start in an hour. You don't want to be late do you?" Star asked, and Basara looked at the alarm clock, it was a different time zone than in Japan.

"Oh crap!" Basara tweaked as he got dressed, and as soon as he and the girls got to their new school, it was a little different.

One guy was watching over the school like a hawk.

"A hero, two demons, and an interdimensional princess, this seems like an interesting group, I'll just keep a close eye on all of this." Said the masked figure, he then disappeared without letting anyone know about who he is, what his motives are, or whom he works for.

But all will be revealed in the next chapter…

[To Be Continued…]

(A/N: Okay I know this is short, but I like to keep my first chapters short sweet and to the point, but this is a bit of an experiment, and I'll try to add some more characters into the story along with more girls to add to Basara's harem, yeah it's a harem story, deal with it. But all in all, I hope to get some more ideas to help this story flourish. So feel free to leave a review, fave, follow, idea for a future chapter, spell for Star to use, etc. Also is it wrong for guys to like Star Vs The Forces Of Evil? I mean there are dudes that like MLP, even though I'm not one of them...but that's my two cents, and until the next chapter, this is the master of chaos, the commander of the legion of corpses, BloodyDemon666 signing off!)