Regular at Gama-Gama Aquarium — This kid basically lives at the place, armed with an annual pass. He's there constantly, soaking up everything about fish.
Fish Knowledge Rivalry with Kuuya — Him and Kuuya have this whole competitive thing going on. They're constantly one-upping each other when it comes to fish facts and knowledge. Fans often note the tension between them, though it's mostly about who knows more.
Crush on Maho — He's got it bad for Maho, Kai's sister. It's the kind of obvious crush that doesn't go unnoticed.
Content compiled by AnimeList.moe from publicly available sources.
