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Manga: Namiuchigiwa No Muromisan

Takurou Mukoujima is your ordinary High School boy who likes to go fishing at the pier in the afternoon. One day, he accidentally caught a green-haired mermaid named Muromi and an unlikely friendship between the two began.

Namiuchigiwa no Muromi-san (Muromi of the Shore) is a gag manga by Najima Keiji serialized on Shonen Magazine Comics. It received a thirteen-episodes anime adaptation which starts airingaired from April 6th of 2013 with twelve minutes length per episode. Now available for viewing at Crunchyroll.

I Caught the Tropes! They're pretty big!