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Motoki is a troubled high school student. Megumi, his older sister, is always having raucous sex with Eika, her lesbian lover. Eika is bisexual and enjoys teasing Motoki, even enticing him so she can have heterosexual intercourse with him. Of course, this irritates Megumi much because she is afraid of losing her girlfriend to her brother. Then there's Motoki's gay pal Yuji, who, although knowing Motoki isn't gay, wants to smack him in the face. Finally, there's Emi, Yuji's sister and Megumi and Eika's buddy. She's also bisexual, and she's rumored to tease Motoki sexually. Will Natsuki, who is gentle and innocent, be his passport to a more normal life?