[Anime Crossover] So You’re an Alien Too

Gunji Akira thought having an alien around was already absurd enough. Even more absurdly, he missed a step and transmigrated to a new world.

Everyone thought he was Sawada Tsunayoshi from a parallel universe.

What, your dad was always away from home and eventually turned into a star, too?

You also have a Spartan teacher (sort of)?

You joined an organization in the underworld, too?

You're also tracking an underground human-trafficking auction?

Wait, look at your spiky hair and your nonstop commentary. You expect us to believe you're not the parallel-world counterpart of the Tenth Vongola Boss? Come on, who'd buy that?

Gunji Akira broke into a cold sweat and began to doubt himself.

Huh... Maybe they do have a point. No, wait!! There's one huge difference! Aliens exist in my world!

Gunji Akira looked at the summoned Sorahashi Sho and the aliens invading another world. With spirals in his eyes and his soul practically leaving his body, he cried from the heart, "Don't you guys think something's weird here?!!"

He pointed at the aliens flying in the sky and his landlord. "Uncle Kawahira is fighting aliens!!!"

Reborn lowered his hat and said casually, "A pureblood Earthling from a million years ago is catching up with an old friend. You can't call that a fight."

Hayato Gokudera excitedly pulled out his notebook and scribbled furiously. "Mr. Reborn is right, they're communicating through physical contact! Amazing, incredible! I have to record the entire UFO encounter!"

Hey!! Could you at least look up at what's actually happening while you spout nonsense?! This is bad! The sky is getting blown apart!!!

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To track down the alien known as "Silver" who killed his father, Gunji Akira joined the Third Combat Squad under the alien-management organization. But he never imagined that after he missed a step and transmigrated, he would end up playing hooky with his boss and coworkers.

Reiji Amamiya, head of the Tokyo branch and his direct superior, smiled at him. "Caster has arrived. What business does Master have with me?"

Father in heaven, I'm going to lose years off my life.

As Dying Will flames shot in every direction and bullets flew through the air, Gunji Akira, utterly defenseless, stared blankly at the crimson Command Spell on the back of his hand.

Tokyo Aliens x Detective Conan + Katekyo Hitman Reborn! x Nura: Rise of the Yokai Clan + Natsume's Book of Friends

Interlude: Dandadan

Bonus chapters: FGO / Alien Singularity

Sho x Akira, 1v1, with other characters having one-sided feelings for Akira.

All other pairings are platonic, except for canon relationships.

Not an ensemble cast; the story is told primarily from Gunji Akira's perspective.

In Japanese, "alien" means extraterrestrial.

Note: The Katekyo Hitman Reborn! storyline begins after the original series ends. Tsunayoshi is 17 and in his first year of high school. Tokyo Aliens begins at chapter 56; Gunji Akira and Sorahashi Sho are first-year high school students. The timeline is adjusted to begin in the year 2000.

Any face-slapping is entirely my own invention.

Theme: Love the world and cherish the people around you.