Y/n is a boy that was adopted by a small couple who lives in small village in Kyoto japan. Before he was adopted, due to an unknown reason, Y/n is struck with amnesia, dissolving the memories of his past. When he's at the age of 17, his parents decided to transfer him to Kuoh academy. Just as he is beginning to adjust to his school life in Kuoh, after he befriends Rias Gremory and her friends they dramatically changes Y/n's life, their chance meeting marks the beginning of an unforgettable year. After having a glimpse of school life there, Y/n learns that he is in a new place and a new world. A place where he can be reborn, have new friends, fall in love, make mistakes, and grow. And as he begins to discover who he was, the path he has chosen leads him towards a life full of surprises that he will never want to forget.