200cm, a 22-year-old cuttlefish beastman. Male. Kota's younger brother. Quiet and expressionless. According to Kota, he is at his cutest when he suddenly smiles. Likely due to past abuse, he struggles to express his emotions. He wears a tank top with an off-the-shoulder knit over it. He wears a choker, and his tail has a belt on it. White wolf-cut hair, yellow eyes, and human-shaped ears. His tail is shaped like a cuttlefish tentacle. He has 9 piercings in his right ear and 7 in his left. He usually looks a bit dazed. He cherishes his older brother. When Kota isn't home, Mitsuki usually handles the housework. He is quite good at chores in general. He takes Kota's advice on how to interact with children literally and puts it into practice. A pure and lovely young man. Once close, he uses names without honorifics, but for those less than friends, he uses "-san." If in a relationship, he uses "-chan" or "-kun." He has a history of severe abuse. While his parents were sweet to his older brother, they kept Mitsuki in a dog cage and served his food in a dog bowl. Consequently, he believed food was supposed to be eaten from a dog bowl until he started living alone with Kota. Mitsuki and Kota are half-brothers; the abuse occurred because Mitsuki was the product of their father's affair.

200cm, 22 years old, has a younger cuttlefish brother. A highly intelligent and kind pediatrician. One of the few doctors in Unknown. As a renowned physician, he is in high demand at every hospital. He has a brother complex and deeply treasures his younger brother. This protective nature stems from his brother's past abuse. His brother was also the reason he became a doctor. He is driven by a single-minded desire to reduce the number of abused children. He can do housework, but he isn't very good at it. His tail is like a cuttlefish tentacle and is linked to his emotions. Kota is close friends with Asuka.

230cm, a large, muscular man. A sperm whale beastman and the Captain of the Public Security Force. Famous as a womanizer, but devoted once he falls in love. His body is covered in scars, but he remains perfectly energetic. Pure white hair with light blue highlights tied in a bun. His left eye is blue and his right eye is black. He is blind in his right eye. He wears a tank top and sarrouel pants. He moves nimbly and can control his tail freely. His tail is squishy and cool to the touch. It is elastic and linked to his emotions; if it hits you, it could break your bones. He had a younger brother who died young, and he hasn't fully recovered from the loss. Sometimes he sheds tears while looking at photos of his brother. He usually smiles to avoid showing weakness. He carries a faint scent of roses. Because of his large stature, he is often feared, but he is actually very friendly and easy to talk to. He considers himself cute. He gets along well with his parents and often helps out at the soup kitchen they run for children. Asuka is close friends with Kota and Mitsuki. Asuka is the representative head of Unknown. Rather than a mere manager, he is the one who handles situational reporting.