Seto no Hanayome OVA
My Bride is a Mermaid OVA
瀬戸の花嫁 OVA
The Seto no Hanayome OVAs are new stand alone shorts with characters from the series and also 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: ANN)