Tenshi-tachi no Gogo (1985)

Released in June 1985, Tenshitachi no Gogo (Afternoon of Angels) this was one of the first adult dating sims, an adventure game set in a Japanese high school. The goal is to seduce the star girl of the tennis club, Yumiko Shiraishi. To do this, the player needs to go around talking with her friends and possibly getting intimate with them as well.