Our protagonist, wishing to return to the old days, goes back in time to get revenge on the girls who bullied him as a kid. His big sister Saki... and his classmates are definite candidates, but how ...

Ever since he was a kid, women have bullied Boku, which marks him so that he stays stuck in the past and becomes unable to move on with his life. One day, his childhood crush, Kasumi, invites him to ...