20-year-old university student Anri is chased out of her house when her mother has a new boyfriend. While spending every night at different Internet cafes, Anri comes to know about "papakatsu" and subsequently meets a 45-year-old university lecturer Wataru. Anri then moves into the apartment which Wataru rents for her before finding out about a secret which he has been hiding from her. Papakatsu refers to the trend of young women looking for men much older than them to date and get financial support from but with no sexual relationship between them.