One day, my mother's friend Sayuri came to my house to participate in my son's graduation ceremony. Her son, Shinji, is so nervous that she can't even imagine that she's the same age as her mother. Seeing her naive appearance, Sayuri senses her love and unexpectedly kisses her. Shinji, who has never dated the opposite sex, escapes into the bath to keep his reason. However, Sayuri can't control her flushed body, so she secretly sneaks into her dressing room...
