​Motoki, a high school boy, finds himself surrounded by a web of complex relationships and sexual tensions. His older sister, Megumi, engages in loud affairs with her lesbian lover, Eika. Eika, who is bisexual, takes pleasure in teasing and seducing Motoki for heterosexual encounters, much to Megumi’s dismay. Adding to the mix is Motoki’s gay friend, Yuji, who harbors desires for Motoki despite knowing his friend’s preferences. As if that weren’t enough, Emi, Yuji’s sister and a close friend of Megumi and Eika, also identifies as bisexual and joins in the sexual teasing of Motoki. Amidst the chaos, the sweet and innocent Natsuki may offer Motoki a chance at a more stable existence.​