Kai is the richest boy in Japan, the son of the head of the multi-million dollar Mikawa Corporation. He rivals Nagasumi for Sun's hand in marriage. He is a killer whale from another mermaid group. Strangely while Sun and Lunar are shown in Mermaid form (torso of a human and tail of a fish) whenever they fail to maintain their human forms, Mikawa is shown as an entire Killer Whale when he succumbs to the effect of water. He also has agoraphobia, which is why he travels only in submarines and wears an astronaut's suit in open spaces. While looking for a servant he befriends Saru.

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. 

**Height:** 174 cm (5'8.5")

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**Non-Anime Roles**:
- Jing Yuan - Honkai: Star Rail (VG)
- Wriothesley - Genshin Impact (VG)
- Van Arkride - The Legend of Heroes Series (VG)


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. <br><br>
(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? <br><bR>(Source: Animewaves)

Kai Mikawa