"Spiral Shell" Maki is an assassin working for the Seto Group, as well a devoted friend of Sun. She, like Gōzaburō Seto, dislikes the idea of "losing" Sun to Nagasumi, and will often distract Sun with sweet talk in order to fire her shell gun at Nagasumi. She also thinks that Nagasumi and Luna should be together.   

(Source: Wikipedia)

Michishio Nagasumi's life couldn't be any more 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 then what he would expect, as he must now protect San from others finding her secret out. 

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An American voice actress, ADR director, and script writer affiliated with Funimation and Seraphim Digital/Sentai Filmworks.

Monica's father is from Pontevedra, Galicia, Spain, and when she was young, her family would often visit there. She would translate for her younger brother some of the European Spanish-dubbed cartoons which included anime like Doraemon and Dragon Ball Z, often imitating the various characters. Monica studied ballet, tap, and jazz, but transitioned to musical theater when was 12. She studied acting through high school as well as college at the University of Houston. She's cited voice actor inspirations from The Simpsons, Family Guy, and Beavis and Butt-head. She was working on a theater show with Jason Douglas, who suggested she audition for ADV Films. Her first voice-over role was a walla in the 1999 dub of Martian Successor Nadesico.

(Source: Wikipedia, edited)

The OVAs are new stand alone shorts with characters from the series and introduces two new ones. It is now the third year of school, San and Luna's dads are still being over protective. All the while Nagasumi has his hands full trying to keep everyone around him under control and rescuing damsels in distress. 
(Source: Anime News Network)

A young boy gets saved from drowning by a mermaid but, according to mermaid law, if a human sees a mermaid's true form, both have to be killed. The only solution to the problem is for him to marry her. But can they keep her secret from being found out? (Source: Animewaves)

An exclusive picture drama released with the Blu-Ray Box Set of Seto no Hanayome. The first part starts out with gags and the characters drawn in a simplistic chibi style. It's followed by a quick recap and then goes into the main picture drama story. 
 
(Source: Kitsu).