Sun Seto  

San, 瀬戸 燦

The sun is the offspring of Seto Groups leader, Gozaburo. She follows the code of honor among mermaids and is devoted to being Nagasumis spouse. Although she's not yet an adult, Sun can't fully control her human form when near water, transforming into a tail. In school, Sun stands out because of her striking appearance, height, and model-like features.