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.

Seto No Hanayome OVA: Complete Box Set Episode titles:

• 1.     A) Classroom of Violence
          B) The Undying Man
  

• 2.     A) What I Can Do For You
          B) Made for Each Other