Anime Crossover: Sign-In for Marvel Skills, Starting with Demon Slayer

After transmigrating into a slice-of-life world blending multiple anime, he gets a System that grants him the ability to sign in for Marvel powers. Just as he's about to enjoy a leisurely life, getting close to the girls from the slice-of-life shows, he discovers that he also has a passive skill that lets him travel to other worlds?

What kind of development is this?

At first, Lin Ze worries that other worlds will be too dangerous.

But he gradually realizes that the real danger comes from the people trapped in the same world as him...

Sign in for the power of the Black Sun, and with a single Sun Breathing technique, Solar Flare, he purges the Infinity Castle and annihilates every demon!

Sign in for spider-enhanced abilities, swing freely above the walls, and drive back the Founding Titan with his bare hands!

Sign in for Stark technology, build a new-energy FRANXX with nanotech, and lead Zero Two to invincibility!

As Lin Ze creates legendary scenes, he also gathers the girls around him and fulfills a hundred romantic dreams, one after another.

Shinobu Kocho: He's the sun, bringing eternal light to Mount Sagiri!

Levi: No maneuver gear, yet he can fight Titans with his bare hands. What a monster...

Nim: Getting bitten is bad enough, but she actually bites me back!

Sora: Why does my brother wake up smelling like a girl every day?

This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Do not imitate.