The Seven Transformations of my Bathtub Circumstances

Orenchi no Furo Jijo · Episode 11 · “The Seven Transformations of my Bathtub Circumstances”

Tatsumi is a high school boy who lives by himself. One day, a devastatingly handsome merman named Wakasa moves into the bathtub in Tatsumi's home. Wakasa is a bit self-centered but cute, while Tatsumi is cool but a busybody. (Source: Anime News Network)