Yuji, her husband's younger brother, has to stay at the couple's house for a month to take an intensive course at a prep school. - Maki ends up taking care of Yuuji, whom she hasn't seen in a while. - Maki's heart is excited by Yuuji's strong back and youthful scent. - Yuuji pours out his young sexual desires on Maki, who is kind and willing to do anything for him. - Although Maki is hesitant, she continues to satisfy her sensuality...