Courtesan Turns the Tables Gintama : Season 6 Episode 5

Many years ago, the famous courtesan Suzuran made a promise with one of her clients. She has waiting in Yoshiwara ever since, hoping meet this man again. Many years have passed and Suzuran is now old and on her deathbed. Gintoki and Tsukuyo decide to track down this man, but are shocked when they find out just who he is.