Terra Story
English name: TriAngle
Genres: Hentai
Type: OVA, Episodes: 2
Aired: Aug 14, 1998 to Sep 11, 1998
Source: Visual novel
Rating: Rx - Hentai
Synopsis:
Keisiuke is a high school student. He falls in love with Misa at first sight. Because he doesn't understand how the girl thinks, he is advised to date with other girls to study. Before the date, he happens to meet Misa and confesses his thought. Several days later, Misa finds him with another girl, and she misunderstands their relations.

(Source: AniDB)