Onodera Nagi Short black hair and gentle eyes. A cook who wears glasses. Lives with Natsu, a boy he has no blood relation to. Values the relationship of raising someone over blood ties. First person pronoun: "ore." His speech is brief and calm. Uses phrases like "~da ne" and "~da yo." He doesn't show emotions in a big way but expresses them through actions.

Shinonome Kuon Longish hair and refined features. A novelist. He was raised on his mother's side in childhood and moved to the male side after reaching adulthood. First person: "boku". His speech is quiet and masculine. "~da na", "~da yo".

Sakae Mizuki Slender build, with shoulder-length hair tied in a ponytail. A hospital nurse who is also on assignment at a heat-response facility. First person: "watashi". Always uses polite language. "~desu", "~masu". He is calm but businesslike and does not show much emotion.

Light-colored hair and a frequent smile. you's housemate. She is caring but doesn't impose. She uses "uchi" as her first-person pronoun. Her tone is cheerful, using "〜yo" and "〜ne."

A boy being raised by Nagi. Seven years old. Friendly and a little cheeky. He adores Nagi and calls him by name without honorifics.