Kamilek

Hello! I am searching for a Anime series (or movie, don't really remember that much). I remember it was about a homosexual guy, who was living in times, when homosexuals had to be hiding. He was in love with his best friend, whose daughter the mc married. At the end he was regretting that he trying to be heterosexual, and that he wasted the daughters life, as she was never really loved by him