Unrequited Love(2017)

At a university football team reunion, former team manager Mitsuki Hiura confesses that she killed a person to quarterback Tetsuro Nishiwaki. She also reveals that as a result of a gender identity disorder, she is now living as a man. Tetsuro and his friends were puzzled by the events leading to her behaviour. They try to protect their old friend as they gradually discover the truth.