
S01E01 The Special Circumstances of My Bathtub
High school student Tatsumi lives alone. One day he spots a person while walking by a river. He approaches the figure and discovers a beautiful man collapsed on the ground.
The doorbell rings. A panicked Tatsumi says, "She's here! I'm counting on you," and Wakasa responds by giving him a thumbs up and saying, "Leave it to me!"
Tatsumi is a high school student who lives on his own, until a merman named Wakasa takes up residence in his bathtub. His solitary lifestyle is turned upside down by the self-centered (but handsome) new roommate.