S01E01 Muromi-san on the Brink
Takuro Mukojima is outside fishing when he reels up a girl who introduces herself as Muromi-san, a mermaid.
Ciel gets the chance to meet a unique cast of characters and later Yeti has to call on Takku for help.
Mukoujima Takurou is a lonely teenager who spends his time fishing at the pier and, to his incredible surprise, fishes up Muromi, a mermaid. Muromi first off doesn't realize she's a mermaid until she meets Takurou. Not only that, she is incredibly dense and crazy and has a drinking problem to top it off. Now every time Takurou goes fishing, Muromi appears and makes life interesting for him.
Source: Mangaupdates
Note: The first 2 episodes received a special pre-air at event. Regular TV airing started on April 7.