Riko ★ Schoolgirl, brother-in-law ★ Sober neat man ... Two people who decided to live in the same house under one roof just under the sudden turn due to the remarriage of each other's parents. Riko, a dull brother who suddenly decided to live with her, is a kid. For three days in the absence of her parents on a couple's trip, Riko is forced to SEX by being voyeurized by her hidden electric massage machine and masturbation in her room. However, there was a surprising match between the two ... Riko and his brother's sex compatibility was really the best. Tsundere's younger sister in the rebellious period is squid by her brother-in-law who hates it!