Coming Out 2005 on netflix

Reiko, engaged to her boyfriend, Aki, meets a lesbian girl on a train who opens her up to the lesbian world. Reiko finds herself attracted to the girl, and is forced to make a difficult decision about her fiance. The film touches upon the delicate question of social acceptance of alternative lifestyles in the closed Japanese society of today. And it also has some steamy girl-on-girl erotica scenes!