Maiko lives with her sister Kanna in Kanna's apartment in Tokyo, where Kanna attends university. Kanna appears to be close with Maiko's boyfriend, Takashi, seemingly supportive of their relationship—but in truth, she has secretly desired him. Kanna lures Takashi in and sets a "trap" to satisfy her own sexual desires. As a result, Takashi is overwhelmed by guilt toward Maiko and gradually driven to emotional collapse. This work is a dramatic, erotic story blending intense human relationships and emotional conflict.