My Bride Is a Mermaid (瀬戸の花嫁, Seto no Hanayome; lit. "The Inland Sea Bride") is a Japanese manga series written by Tahiko Kimura. The manga was serialized between the September 2002 and May 2009 issues of Monthly Gangan Wing, and the June and December 2010 issues of Monthly Gangan Joker, both published by Square Enix. In 2004, a drama CD based on the series was released by Frontier Works. A 26-episode anime television series adaptation animated by Gonzo and directed by Seiji Kishi aired in Japan on TV Tokyo between April and September 2007. Two original video animation episodes were released in November 2008 and January 2009. Odex, a Singaporean distributor, released it in English in Singapore as Seto No Hana Yome. The anime was licensed for a North American distribution by Funimation Entertainment and was released in 2010 under the title My Bride Is a Mermaid!.
Michishio Nagasumi's life couldn't be anymore normal. In an odd twist of events, during his summer vacation, he ends up almost drowning in the sea. Luckily, the cute mermaid Seto San appears to save him. However, San is from a yakuza mermaid family and according to their law, if a human is to catch sight of a mermaid, either he or the mermaid must die. The only other way is for Nagasumi to be taken in as a family member, marrying San. In attempts to save both of their lives, Nagasumi asks for San's hand in marriage. Nagasumi's summer vacation reaped more than what he would expect, as he must now protect San from others finding her secret out.