Released on year:2007
Nagasumi Michishio, a middle school student, visits the Seto Inland Sea during his summer vacation. His leg cramps up one day while swimming at Mio Sun Beach. He sinks into the ocean, where he is left to drown alone, because no one is close enough to hear his desperate screams for help. However, just as he is about to pass out, a mermaid appears and saves his life.
Nagasumi is visited by his savior that night, a girl who introduces herself as Sun Seto, a yakuza mermaid. As it turns out, a mermaid whose identity is revealed to a human is subject to execution under mermaid law. The Seto family proposes a solution to avoid this dreadful outcome: Nagasumi must marry Sun or die at the hands of Gouzaburou, Sun's father and the Seto clan's boss. Nagasumi accepts her hand in marriage because she has no other choice.
Now the newlyweds must work hard to keep their relationship a secret. A genuine and innocent love blossoms between the pair as they adjust to their new life, despite Gouzaburou's never-ending attempts on Nagasumi's life and the eccentric antics of a slew of antagonists.
Mari Yamazaki's manga series Thermae Romae (Japanese:, Hepburn: Terumae Romae), stylized as Therm Rom, is a Japanese manga series. At the 14th Tezuka Osamu Cultural Prize, it won the third Manga Taish and the Short Story Award. Yen Press has licensed the manga in North America. A live-action film adaptation was produced by Fuji TV and released on April 28, 2012. In 2014, a sequel, Thermae Romae II, was released. In January 2012, DLE Inc.'s anime television adaptation aired on Fuji TV's Noitamina block in Japan. Discotek Media in North America and Siren Visual in Australia have both licensed the show. NAZ has announced that Thermae Romae Novae, an original net animation (ONA) anime series, will premiere on Netflix in 2022.