The Bride Is Wet on the Wedding Night (2000)

Hatsune, currently unemployed, lives with her lesbian friend, Mika. She had been dating a man named Kokubu, but their relationship ended in a chaotic scene when his wife showed up while they were having sex. Although devastated by the deception, Hatsune managed to bounce back thanks to Mika's support. Then, one day, her older sister Shizuka revealed that she had a new boyfriend named Itoyama. However, Itoyama turned out to be a marriage fraudster who was actually after Shizuka's savings...