Papa Katsu(2017)

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.