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With his stepmother dead, and his father transferred to another city, Yuto is living alone with his ample-bosomed step sister Erika. Temptation soon gets the best of them and they start indulging their forbidden passions. They also attend the same university and it’s not long before their equally ample-bosomed music teacher, Sayaka, discovers their taboo relationship. Sayaka begins falling love with Yuto and threatens to reveal his secret if he does not succumb to her needs. This twisted love triangle spells nothing but trouble and is bound for a surprising finale…