Natsu e no Tobira
Genres: Boys Love, Drama, Romance
Type: Movie, Episodes: 1
Aired: Mar 20, 1981
Studio: Madhouse, Toei Animation
Source: Manga
Rating: PG-13 - Teens 13 or older
Synopsis:
Marion is a young schoolboy who prides himself on his adherence to a philosophy he calls "rationalism". Because of his disdain for emotional display, he ignores anything remotely akin to affection. But when he's entangled in a romantic affair with an older courtesan, his rationalism is revealed to be little more than a cover for his own emotional immaturity. Learning to love, Marion blossoms under his older lover's care but unfortunately, Marion has yet to learn the true price of the affair.

(Source: ANN)