Sanemi Shinazugawa was the strongest Hashira demon slayer in the past, he had a younger brother named Genya who he secretly loved very much.

The world has changed to become modern, schools exist and so on. until one day, during the day. Sanemi was waiting for Genya to change into the clothes Muichiro gave him.

"What the hell is taking him that long?"

Sanemi muttered a little annoyed, he crossed his arms and waited for Genya to come out of the changing room while stomping one foot slowly.