Misshitsu no Netsujou

A young man named Takuma Ichinose tries picking up a girl on the street and surprisingly succeeds. He invites a tanned girl named Natsu Hayasaka to a karaoke box. They play a karaoke scoring game where the loser has to do whatever the winner says. Natsu wins the first round and teases Takuma, but then Takuma wins the next round. Things escalate quickly in the private room, leading to a passionate sexual encounter.