Undercover Erotic Chronicle: Searching for a Mature Bride

Original title: 隠密濡物帳 熟れごろ嫁さがし

Kakuzo is a ninja living in a certain village. Worried about his son's future, his father sends him to the city to find a wife. After spending all his money on prostitution, Kakuzo moves in with Sayuri, who runs a coffee shop by herself.