- Voice Actor (CV)
- Kaito Ishikawa
- Role
- Protagonist
- Identity
- A land-dwelling youth with oceanic heritage, who begins as a fisherman's apprentice and later pursues marine research at university
Personality
Unflappable
Perceptive
Candid
Self-reliant
Tsumugu Kihara is a young man raised on land alongside his fisherman grandfather, yet carrying the sea within his very blood. Drawn by an inexplicable fascination with the ocean, his life changes when he rescues Manaka Mukaido—a girl from the underwater world—forging an unlikely bond with the sea-dwelling people. Though his blunt honesty and reserved demeanor can come across as aloof, those close to him know him as a steadfast and warm-hearted individual. As the story progresses, Tsumugu channels his lifelong curiosity into a university career dedicated to marine science.