Kenkō Zenrakei Suieibu Umishō

Kenkō Zenrakei Suieibu Umishō (ケンコー全裸系水泳部 ウミショー) is a Japanese manga series written and illustrated by Mitsuru Hattori. It was serialized in Kodansha's manga magazine Weekly Shōnen Magazine from July 2005 to April 2008, with its chapters collected in nine volumes. A 13-episode anime television series, produced by Artland and directed by Kōichirō Sōtome, was broadcast from July to September 2007.

Plot

Within the Kanagawa prefecture lies the seaside city of Umineko. There, Kaname Okiura, a student in his second year of high school, attends Prefectural Umineko Commercial High School (県立海猫商業高等学校), or Umishō (海商) for short. He is also the manager of the high school swim team though he himself does not know how to swim. In fact, he is afraid of the water stemming from an incident which occurred some years ago. While he was at the beach, he had nearly drowned when a "mermaid" pulled him under the water. He joined the school's swimming club in order to learn how to swim, but the club is filled with weirdos, who do not teach him swimming.

One day, a floating house arrives at the shores of Umishō bearing two persons. One of these is a cheerful, sunny, happy-go-lucky girl named Amuro Ninagawa, a transfer student, and the other is her father. Her incredible swimming speed makes her an instant hit with the swimming club, but Kaname is surprised, as she reminds him of the mermaid he saw only once in his early childhood. After her floating house is destroyed during a storm she moves to Kaname's house.

The fictional island of Onoshima (緒ノ島), where the series is set, is modeled on the real island of Enoshima in Fujisawa, Kanagawa.

Characters

• Amuro Ninagawa (蜷川 あむろ)
• Amuro Ninagawa is a second-year transfer student at Umishō High School, originally from the Daito Islands in Okinawa. A naturally gifted swimmer accustomed to open-water swimming, she struggles with competitive pool events due to unfamiliarity with regulations and confined spaces—once colliding with the wall mid-race. Her unconventional behavior includes a preference for swimming nude, which she does unselfconsciously, particularly around Kaname Okiura. Despite her raw talent, adapting to structured competitions remains a challenge.
• Kaname Okiura (沖浦 要)
• Kaname Okiura is a second-year student and manager of the Umishō swim team. Traumatized by a childhood encounter with what he describes as a mermaid, he developed a fear of swimming that begins to fade after Amuro Ninagawa's arrival. While frequently exasperated by her unpredictable behavior, he gradually develops romantic feelings for her, though he often denies them.
• Momoko Orizuka (織塚 桃子)
• Orizuka is a third-year student and vice-captain of the Umishō swim team. As the most disciplined and level-headed member, she frequently serves as the straight man to her teammates' antics, particularly clashing with Ikamasa's irresponsible behavior. Her no-nonsense attitude and strong leadership help maintain order within the team.
• Maki Ikuta (生田 蒔輝)
• A first-year student at Umishō High School, nicknamed Makio (マキオ). Frequently mistaken for a middle schooler due to her petite stature, she remains a novice swimmer who receives instruction from Kaname Okiura while training with the team.
• Masa Ikariya (碇矢 雅)
• The third-year captain of the Umishō swim team, nicknamed Ikamasa (イカマサ). Known for his muscular physique and eccentric behavior, he frequently irritates teammates with his obsession with shaving body hair and preference for revealing swimwear. His antics often disrupt team activities.
• Mirei Shizuoka (静岡 みれい)
• Shizuoka is a second-year student at Umishō High School. While admired for her swimming prowess—having nearly won the Kantō Tournament's 200-meter event—she exhibits paradoxical behavior: intensely self-conscious when observed, yet privately promiscuous, wearing revealing lingerie and collecting phallic objects like kokeshi dolls. This trait mirrors her parents' overt sexuality. Though displaying possible romantic interest in Kaname Okiura, her feelings remain ambiguous. As the granddaughter of the Shizu Group's founder, her background contrasts with her timid demeanor.
• Maaya Nanako (魚々戸 真綾)
• Maaya Nanako is a first-year transfer student, a competitive swimmer and model who joins Umishō to pursue her childhood crush on Kaname Okiura. Viewing Amuro as a romantic rival, she frequently clashes with her. Distinctive for her small fang and custom swimsuit, Maaya resents larger-breasted teammates like Amuro and forms an "Alliance" with Makio to address their shared insecurity about breast size.
• Sanae Kise (黄瀬 早苗)
• Sanae is a third-year student and co-founder of Umishō's swim team, as well as Momoko Orizuka's childhood friend. Known for her mischievous behavior, she frequently causes trouble for others and fabricates stories both to tease teammates and attract male attention.

Media

External links