Someone's Girlfriend #6

Plot

Riku’s summer break heats up to a boil! Three women compete for his attention, including his best friend’s girlfriend. While the two younger classmen, Umimi and Yako, grow bold, Shizuku continues to prove there’s no boundary she won’t push to tease Riku to his absolute limit. With threadbare resolve, can Riku find a way to get the girl of his dreams while not hurting those he cares about?