Aika, a flashy yet domestic wife, married a man with a child despite opposition from those around her. She had a good relationship with her stepson and the three of them lived happily together. However, one day, she was completely transfixed by her stepson's erect crotch, which she had never noticed before. Seeing his remarkably large penis, Aika began to view her husband's son as an 'opposite sex.' This led to the beginning of a twisted incestuous relationship with her stepson.
