Transmigrating to various anime worlds, Lin Yi is bound to a god-level sign-in system and starts his journey by parachuting into Demon Slayer!

Sign in at the Kamado house to unlock the Demon Blade Thousand Blades, unleashing a multitude of blades to slay all evil spirits; sign in at the Wisteria Forest to obtain the perfect inheritance of the Breath of the Sun, where the blazing sun burns away the darkness of night.

Starting from the world of Demon Slayer... In each world, he keeps checking in and getting stronger! Eventually, he becomes an unparalleled powerhouse spanning multiple anime series!