A first year student, nicknamed Makio. Too small for her age, she is usually confused with a junior high student. Despite being a member of the swimming team, she is still learning how to properly swim by taking lessons from Kaname.

Kaname Okiura, a student of Prefectoral Umineko Shougyou High ("Umishou" for short), joined the school's swimming club in order to learn how to swim, but the club is filled with weirdos, let alone who can teach him swimming. Then, a sunny, happy-go-lucky girl named Amuro Ninagawa who transferred from Okinawa joined the club. Her extraordinary underwater speed and unorthodox swimming style (plus her personal habit of nude swimming&mdash;a powerful magnet to teenage boys) surprised every club member, especially Okiura, because she reminds him of a mermaid-like creature he saw only once in his early childhood.
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(Source: Anime News Network)

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Ai Shimizu is a Japanese voice actress and professional wrestler. She has a career as a singer, signed to Lantis. She has released 14 singles (including joint and character singles) and four albums. She covered Yumi Matsutoya's "Toki o Kakeru Shōjo" as the B-side of her first single "Angel Fish" in 2003. She is known to have a close relationship with Mai Nakahara, having collaborated in eight anime where most of the characters they voiced in together had close connections: DearS, Kage Kara Mamoru!, My-HiME, My-Otome, My-Otome Zwei, Please Twins!, Sola, Strawberry Panic! and the Lucky Star drama CD. Shimizu has worked sporadic professional wrestling matches since December 2013

Kaname Okiura, a student of Prefectoral Umineko Shougyou High ("Umishou" for short), joined the school's swimming club in order to learn how to swim, but the club is filled with weirdos, let alone teaches him swimming. Then, a sunny, happy-go-lucky girl named Amuro Ninagawa who was transferred from Okinawa joined the club. Her extraordinary underwater speed and unorthodox swimming style (plus her personal habit of nude swimming&mdash;a powerful magnet to teenage boys) surprised every club member, especially Okiura, because she reminds him of a mermaid-like creature he saw only once in his early childhood. 
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(Source: Anime News Network)

Maki Ikuta