Hikaru has been pining for the girl next door, Mioto. But she's going out with his friend Hakuro, and he ends up watching the two have sex through a peephole every day. Hikaru has also been sleeping with Akimi, and she walks in on him spying one day. She'll keep his secret, but on one condition. Akimi's always had a thing for Mioto's boyfriend, and she wants his help to arrange for a little partner swap. But soon he'll find that the whole thing was a plan between Akimi and Hakuro to get Mioto and Hikaru involved in a four-way orgy.