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The Misaki family, whose mother passed away two years ago and lives with her father, daughter and son. The father works hard for the family, the siblings look at the father's back, the daughter does housework on behalf of the mother while attending school, and the son also starts working and lives in harmony with the parent and child. However, my sister Kanna has secretly had more feelings toward her younger brother than her brother and sister, and spends her days masturbating and killing those feelings. However, one day when his father is no longer on a business trip, Kanna takes a drastic action against her younger brother! !!