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Eri, the father's remarriage partner. (Why is such a good woman my father ...) My son Shinichi began to be aware of Eri, who is too young and beautiful to call her mother-in-law, as the opposite sex from a certain time. However, an event happened that seemed to play with Shinichi's motives. Eri had been fooling around by inviting a man to her house while her family was away. Shinichi, who accidentally witnessed the scene, gets angry and at the same time, the thoughts of the lower class graze his mind.