Akari, the beautiful daughter-in-law of a son, has been living with her widower father-in-law Shigeru for several months. Moving in together with her husband, Akari has been working on conceiving for some time, but has not seen any results. After undergoing tests at an infertility clinic, she finds out that there is a problem with her husband's sperm... Then one day, her husband is scheduled to go on a business trip for three days and two nights. Akari and Shigeru are alone under the same roof, and Akari, desperate to have a child, suddenly changes her personality and sneaks into Shigeru's bedroom where he is sleeping...