About the book: year / My name is Sin, and I am the keeper at the martial arts school! I know and remember thousands of techniques that have become our heritage. My whole life is the preservation of knowledge. I was reborn in a broken world after the destruction of the school that was my home. This is a foreign world for me, a strange life, a strange body. But since I have a second chance, I will do everything to revive the Sword School here and make the whole world talk about it! Cause I'm the keeper.