Kanzaki Aoi and Kurusu Akito have broken their childhood relationship and are no longer together. Kaya, a girl who has been interested in Akito, decides to be with him instead. But, her efforts fail to make him forget about Aoi, who chose their P.E. teacher, Shudo, out of lust and has become the Shudo's mistress. During her attempts to gain Akito's affection, Kaya is blackmailed into having sexual acts with a guy who has been watching her. As she is forced to let him have his way with her, Kaya begins having obscene thoughts about Shudo. Little does she know that the teacher has been planning this all along... 

Kanzaki Aoi is a popular high school idol who has a love relationship with her childhood friend and next door neighbor, Kurusu Akito. They are always together, even going to school in the morning together. She admires him and respects him also, and still remembers the time he saved her when they were younger. All of their dreams to stay together come crashing down, however, when Aoi is forced to participate in daily obscenities with the physical education teacher, Shoda. With each day, she comes to realize that she enjoys it more and more. Even after powerless Akito discovers the truth, Aoi shows him just how much she wants Shoda instead. 

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