My Demon Slayer Seems a Little Different

Ye Tian, ​​who was taking a nap in class, came to the world of Demon Slayer in a daze. As a result, he found that something was wrong with his Demon Slayer. He seemed. . . He came to the modern era where the plot ended, but thankfully he got the super sign-in mission system, so he lived a life of luxury and luxury. But two years later, he found that there seemed to be more things in the world that should have been eliminated during the Taisho period.