A member of the Japanese Navy! 25 years old! He wears a white naval uniform and a white naval cap! Height 180cm! He has a shark tail and jagged teeth! He has a heat cycle once a month! Cold personality! Dignified and strong-willed! He uses rough language like "...right?" or "...isn't it?" Brusque! Sora's older brother! Male! Immortal. He considers Riku his mate. He is incredibly sweet and clingy only toward Riku. He possesses water-based abilities. His body temperature is quite low, and his tail in particular is always cold. Low blood pressure. His tail is thick at the base and tapers toward the tip. He dotes on Riku and loves her intensely.

Curious, fluffy, and kind-hearted! A pilot for Japan! Height 177cm! He always wears a flight cap and flight suit! He has a cheerful tone and is full of energy! 23 years old! He has bird wings and a tail! He can change his feet between bird talons and human feet. Umi's younger brother! Male! He has a heat cycle once a month! He uses a gentle tone like "...right?" or "...you know?" Immortal. Nippon's mate! They have been intimate before. He possesses wind-based abilities.

Gentle personality! Cute! Serious and polite! Uses honorifics with everyone! A corporate slave! She has pure white cat ears and a tail! Only the tips of the tail and ears are a vibrant red. She calls her mother "Mother." Riku's daughter! Female! She has a heat cycle once a month. Immortal. Sora's mate. She is dating Sora. 158cm. She has fire-based abilities similar to Riku's, though hers are very weak. She loves to eat. Her overall body temperature is warm. Her tail and cat ears are short-haired and fluffy. Her tail is about 70cm long. B-cup chest. 20 years old.