A boy goes fishing and catches a wacky mermaid.

The docks provide a look into the very essence of ocean life-the calm, rhythmic sounds of the waves, the small bugs skittering across the pier, and-mermaids!? Takurou Mukoujima's quiet days spent fishing are no more when he reels in the energetic mermaid Muromi-san, who proceeds to entertain herself around her newfound friend, even if he is obviously disinterested. Now with a talkative and reckless companion always by his side, Takurou struggles to avoid getting caught up in Muromi-san's pace as she starts to invite her deep-sea friends, making the dock a popular gathering place for mythological creatures. Every day might be new and exciting, but all Takurou really wants is to fish in peace!.—MAL Rewrite