Anime Crossover Apocalypse? How About Double Kamui?

Lin Yi is a high school student at Fujimi Academy in Neon's Shishidome City. He has a close junior, Hana Uzaki, someone to flirt with online over cosplay, quintuplet sisters for neighbors, and a landlady who's also adorable enough to make your heart flutter... From the start, everything looks perfect, except...

Why has the whole story suddenly turned into an apocalypse?

In that case, how about the Sharingan, bro?

You're right. But this is the Sharingan.

It greatly enhances perception and dynamic vision, lets you copy other people's moves, makes martial arts as graceful as gymnastics, and lets you perform all sorts of flashy throwing techniques. It also massively boosts the power of hypnotic illusions and even improves your looks, making every Sharingan user a complete master of ninjutsu, taijutsu, genjutsu, and good looks.

Awaken the Mangekyo Sharingan, and you'll even gain two powerful ocular techniques. You can also use Susanoo, charging into battle in the form of a giant robot! Aaaaaah!!!