Des：Her younger sister Norim is shy and quiet even in front of her family, but she is actually very curious about sex and has feelings for her older brother Hajime. One day, Hajime is assigned by his parents to look after them while they attend a relatives memorial service. When Hajime tells Rimu his feelings for her, he ignores her, saying, Were brothers, right? But when hes forced to say, Its okay to have fun, its just a physical relationship, he crosses the line limit. Afterwards, the two let loose and enjoyed sex for two days without the company of their parents.