Mitsuya Souma, a first-year student, has lived his entire life with his choices dictated by his mother, who aims to shield him from past family tragedies. He finds comfort and freedom solely through playing the violin, a gift from his bedridden grandfather, Yoshimitsu. Yoshimitsu's time is nearly up, and one night, the dreaded phone call arrives regarding his sudden health decline. At the hospital, Mitsuya argues with his mother, only to be brutally interrupted when an earthquake strikes the city. Mitsuya tumbles down the stairs, strikes his head, and loses consciousness. Upon waking, Mitsuya discovers he has been transported back to the Taisho era, surrounded by his grandfather's family and friends. Confused and struggling to cope, he decides he must fix his grandfather's greatest regret. However, Mitsuya has no clue where to start. He must navigate his way through a growing relationship with Jin Kasuga—his grandfather's best friend—and escalating family drama.