|Serialization = Comic Gene}}Tatsumi is a high school boy who lives by himself. However, 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.
|Serialization = Comic Gene
[[http://global.bookwalker.jp/deceabc5ca-7395-49e0-8cbb-0ac1e25ca353/?adpcnt=7qMVsbO|Englishtranslation in Digitalformat]]
What happens when an intruder from the sea stakes claim to your bathtub? A cool yet demure teenage boy named Tatsumi must learn to live with the self-obsessed and playful merman, Wakasa, in a small Tokyo apartment. These two dissimilar young men will learn what it takes to deal with one another in their everyday lives. Of course, impromptu visits by Wakasa’s ocean friends–an anthropomorphised octopus, jelly fish, and hermit crab–do not make things easier. Welcome to Tatsumi’s bathtub. It’s getting crowded.