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.
There's a mermaid... actually, 
a merman, living in my bathtub at home.
هنالك حورية بحر‏.‏‏.‏‏.‏ خَيْلان بحر في الواقع
يعيش في حوض الاستحمام خاصّتي في المنزل‏.‏
In meine Badewanne lebt ein Fischmensch.
Zudem noch ein männlicher.
Hay un tritón viviendo...
En la bañera de mi casa...
Une sirène habite
dans ma baignoire.
Há uma sereia... na verdade, um sirene, 
morando na banheira da minha casa.