Sei is not a real mother. She is Sei-san, whom my father remarried when I was young. One year after I got married, my father passed away, and he only raised me with a woman. As a mother and a woman, my dream when loving Sei-san was to make him happy and comfortable. However, that dream shattered at the hands of a bad friend, Takato. Takato, who used me to get closer to her mother, left early due to a fake illness and talked to Sei-san. I was worried and quickly returned home, and I saw an astonishing sight ...