That JAV

Three years after marrying after a workplace romance, Rinko, a wife, lives with her husband's younger sister, Yu, who moved to Tokyo to become a photographer. Yu is a little younger than Rinko, and she loves him as if he were her own sister. One day, her husband goes away on a business trip for three days. The two sisters-in-law were alone under one roof. Normally, women should be able to live together without worrying about each other, but Yuu has a secret that she can't tell anyone. Yuu has had a crush on Rinko since the first day they met...