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.
You can now watch Merman in My Tub online on the following streaming providers in the United States.
| Visual Effects | Koji Haneda | Character Designer |
| Sound | ayame | Theme Song Performance |
| Writing | Itokichi | Comic Book |
| Sound | ayame | Songs |
| Writing | Yuniko Ayana | Series Composition |
| Visual Effects | Koji Haneda | Supervising Animation Director |
| Directing | Sayo Aoi | Series Director |
| Crew | Tasuku Ishibashi | Special Effects |
| Art | Kouki Nagayoshi | Art Direction |
| Art | Hiromi Bando | Art Direction |
| Editing | Akari Saitoh | Editor |
