Introduction: Of all the stories of done, two of my favorites are my original crossovers between Yu-Gi-Oh! GX and Strawberry Panic. They were two of the first fan fiction stories I had ever written, and while they may not be my best creations (in fact I may go back and give them both a bit of a polish at some point), I consider them both to be great triumphs. I mean the concept behind them was so simple and yet elegant! It was essentially minor surgery to turn a series like Strawberry Panic into a Yu-Gi-Oh story. Well, back during the summer of 2015 or 2016 (it was the year when Jurassic World was in theaters), I managed to get my hands on the complete Strawberry Panic anime on DVD, and seeing that anime once again after so many years made me want to do a third crossover story.

So I began trying to figure out what sort of story this crossover would have, and after a while I realized I could do something involving the Legendary Planets from the GX manga. I had established Elemental HERO Terra Firma as Shizuma's ace monster in this continuity of GX, and in Ritual of Doom I had used David Rabb, Reggie Mackenzie and Principal Mackenzie as part of the cast. So with four Planet users already established, a story involving all of the Legendary Planets made total sense. Of course first I had to establish a few other characters as Legendary Planet users, and a large part of the reason why VR Duelists and Viper's Grudge were written were to do just that. And now that I've finally gotten that task done, this crossover can now get off the ground.

Now before I get too far in, I should probably mention that I had to come up with a different backstory for the Legendary Planets in this continuity, so anyone expecting a story involving Tragoedia will unfortunately be disappointed. If I was going to do that, I would've had Principal Mackenzie as Tragoedia's pawn just like in the manga. And since that ship has already sailed, I had to come up with something new. I'm certain though that everyone will like the new origin of the Legendary Planets that I've come up with, and the new reason behind they were made.

Disclaimer: I do not own Yu-Gi-Oh! GX or Strawberry Panic.


Prologue: Forbidden Planet

It was very late in the afternoon as Amane Otori made her way back to the Strawberry Dorms. She had been out for the past few hours riding her horse and had lost all track of time. Amane's route took her past a cliff on the island that overlooked the ocean, and as she passed that spot she noticed a young woman standing near the cliff's edge looking out towards the slowly setting sun. She had long shiny black hair, porcelain skin and deep red eyes like the color of wine. The woman was wearing a St. Spica Academy uniform.

Amane instantly recognized the young woman as an old friend of hers, Akana Tsukasa. During Amane's first two years at the academy, Akane had been her roommate. They were quite good friends during that time, but then they ended up drifting apart; though not because of any fight between them. Part of it was due to the fact that Amane was often away from the island for duel tournaments and horse riding events. Then later when Amane had become involved with her girlfriend, Hikari Konohana, the divide between her and Akane became even wider. Of course there was another reason why Amane and Akane had become so distant, and it was a very painful one indeed.

Upon noticing the sad expression on Akane's face, Amane decided that now might be the perfect time for the two of them to reconnect. It seemed to Amane that Akane could really use a friend.

"Hey there, stranger," Amane spoke as she approached, getting the dark-haired girl's attention.

"So, the Prince of Spica has deemed to grace me with her presence," Akane responded somewhat coldly. "Do what do I owe this honor?"

"Hey! Don't be like that," Amane responded. "I know that you and I haven't talked in a long time, but it looked like you could really use a friend right now."

"Do you have any idea what today is?" Akane asked. "It's the anniversary of the crash."

And there it was, the main reason why Amane and Akane had drifted apart. A year before the professional duelist, Jaden Yuki had visited the island, a plane carrying a group of Spica students who had been selected to take part in a special tournament crashed into the ocean. There were no survivors. One of the students who had died in the crash was Akane's girlfriend, Mahiro Mizuki. Akane was totally devastated when Mahiro died, and ever since that time she was never the same as she once was.

"So if you don't mind, I would really like to be alone right now," Akane continued. "I can't stand to be around anyone on this day, least of all you."

"What's that supposed to mean?" Amane asked.

Anger flared in Akane's eyes as she turned to face Amane. "Are you really that clueless? Not only are you the most successful duelist on the island, you have a lover to share that happiness with. Meanwhile all I have is a gaping hole in my chest that'll never heal. The last thing I need is to be around someone who reminds me of everything I could've had but don't."

With that, Akane stormed off before Amane could utter a single world. Amane watched as her old friend walked away and let out a heavy sigh. For a moment, she thought about going after Akane, but in the end decided that there would be no point since Akane would likely not want to listen to a single word she had to say. Besides, it was getting late and she needed to get back to the dorms. She didn't want Hikari to start worrying about her.


The sun was finally starting to set as Akane walked along the beach at the island's edge. She had been walking for hours, not really paying attention to where she was going. She just needed to get away from Amane and had somehow made it down to the beach. As Akane finally took a good look at her surroundings, she saw something directly in front of her that sent a stabbing pain through her chest. It was an old abandoned lighthouse that had been on the island since before the three academies had been founded.

That spot by the lighthouse had been one of Mahiro's favorite places on the island. It was a place where the two of them could be alone, since hardly anyone came near the old lighthouse. Being back at that place brought back so many memories for Akane, memories that were incredibly painful because of their happiness. They were reminder of everything that Akane had lost. And with today being the anniversary of Mahiro's death, that lighthouse was the last place Akane wanted to be at the moment.

Akane was about to head back for the dorms when the door to the lighthouse suddenly opened on its own. This was quite the surprise, as the lighthouse door had always been locked. Akane's curiosity ended up getting the better of her grief, and after a moment's hesitation she decided to go in and have a look. Many times both she and Mahiro had often wondered about what the inside of the old lighthouse was like. Now seemed like as good a chance as any to finally find out.

Upon entering the old lighthouse, Akane's nose was hit by the musty odor of dust and years. The small high windows on the walls provided a dim lighting to the place, enough for Akane to see what was inside. Scrawled all over the walls in cursive were several lines of mad ramblings that seemed to be just one long sentence. Much of it seemed to be in a language that Akane didn't understand. Though it was hard to tell in the dark, the writing seemed to go up the wall all the way to the very top of the lighthouse.

It deeply unsettled Akane to learn that the lighthouse that was Mahiro's favorite place seemed to hide such a dark secret. Akane didn't know who wrote all those words on the wall, but it seemed clear that the person was totally insane. She was about to leave to the place and try to forget that she ever saw the mad script when suddenly a wooden door in the far wall right across from her opened on its own. In the darkness beyond that door, Akane saw a spot of multicolored light. Once again, Akane's curiosity got the best of her and she decided to go and investigate.

Akane made her way down a small staircase that seemed to lead into some kind of storage cellar. There on a pedestal against the far wall of the cellar was a Duel Monsters card inside a glass case giving off a strange multicolored aura. That aura was the source of the light that had drawn Akane into the cellar. Against her better judgment, Akane decided to go over and take a closer look at the card.

The card was a Fusion Monster of the Light attribute known as The Invader X. As Akane's examined the card's text through the glass case, she saw that the card's effect had a special condition that classified it as a Legendary Planet monster. This greatly surprised the dark-haired girl, as she knew about the Legendary Planet monsters, and this card was not any of the ones she had heard of. The ten cards that she knew about were based on the sun and the nine planets of the solar system. As Akane pondered this mystery, she wondered if perhaps this card was based on the old science fiction concept of Planet X, a theoretical tenth planet of the solar system that was often used as the home world of hostile aliens bent on attacking the Earth for one reason or another.

Akane removed the glass case so she could take the card back with her in order to examine it more closely. The moment she touched the card though, the aura surrounding it suddenly turned white and traveled up her arm. Akane cried out as a brilliant white light surged through her entire body. After a few moments, the light finally faded and Akane staggered back a few steps. As she regained her balance, Akane looked at the card she was now holding and a series of strange thoughts suddenly occurred to her.

Looking at The Invader X, Akane thought about Amane and how her old friend had the happiness that she had lost. She then thought about how she could make Amane feel the same pain and sadness that she lived through every day. But it wouldn't just be Amane though. It occurred to Akane that she could perhaps somehow make everyone in the world experience that same pain. And as Akane had these thoughts, a mad smile came to her face and her eyes began to glow with a strange multicolored light.


Author's Note: Those of you reading have probably noticed that Akane's backstory is pretty similar to Shizuma's. That of course was deliberate. Anyway, The Invader X was indeed inspired by the fabled Planet X, but the inspiration also comes from a recent sci-fi movie that came out back in late February. Let's see if anyone reading can guess what movie that was. The fact that Akane found the card in an abandoned lighthouse is a major hint.

Please review and let me know what you think.