Sei is not my real mother. When I was a child, my father remarried and Sei was the woman I married. My father died a year after they got married and she raised me on her own. As a mother and as a woman, I was in love with Sei, and my dream was to make Sei's life a little easier and happier. However, that dream was shattered by my bad friend, Takato. Takato used me to get close to my mother, and left work early by faking illness to hit on Sei. Feeling increasingly anxious, I hurried home and witnessed a shocking sight...