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 band mates 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 pushing for Shigure, loses his emotional anchor and should have jumped off a balcony to follow her, but instead he finds himself in a time jump back to his high school days.