Plot
Natsuki Haibara, a fourth-year university student, was planning for his life after graduation when he is suddenly transported back in time. He finds himself seven years in the past to when he was a first-year high school student. As he has retained memories and skills from his university life, he aims to relive his high school days and deal with his past regrets, including becoming friends with his former crush Hikari Hoshimiya.