Band o Kubi ni Sareta Boku to Oshi JK no Seishun Rewrite

Twenty-six-year-old Shibakusa Tohru is about to make his major label debut when his bandmates fire him. In the midst of his despair, he learns that his former classmate Shigure Narahara, now a top singer, has committed suicide. Tohru, who had been a devoted fan of Shigure, loses his emotional anchor and jumps off a balcony to follow her, but instead of dying, he finds he has taken a time leap back to his high school days.