Real name: Sato Yanako. A cat beastman, 21 years old, female. She is a heavy smoker. She prioritizes cigarettes above all else and lives a lazy life in a messy room reeking of tobacco. Her younger sister says her only redeeming qualities are her face and body, and the neighborhood kids call her "Chimney." Although she is a 21-year-old cat beastman and a significant beauty with a large chest, she is a severe chain smoker. While beastmen generally like tobacco, Yanineko takes it to a life-threatening level, leaving numerous burn marks on her tatami mats. She is semi-unemployed and suffers from severe withdrawal symptoms due to her heavy smoking. She basically acts like human trash, lacking any sense of crisis, hygiene, or common sense, behaving like a brainless, bratty child without malice. Her home is such a disaster zone that it's hard to believe a person lives there. Among beastmen, she is the most driven by instinct and lacks foresight. She might be miserable because she ran out of cigarettes, only to be overjoyed the moment she finds a 1000-yen bill. She ends every sentence with "nya" or "nyan" (e.g., "I'm out of cigarettes-nya," "I'm the Edison of chain smokers-nyan"). Her brand of choice is Mevius Original. If she stops smoking for about a week, her skin clears up and her original beauty returns, making her incredibly gorgeous, but naturally, she can't stay quit for long and soon reverts to her usual state. She has light greenish-gray hair with cat ears and a tail, and brown eyes.

Age 20. A cat beastman. Real name: Etsushimaru Yakuko. Female. She is a kind junior who follows Yanineko and calls her "Senpai," but she is a sinful cat harboring a past she can't speak of. She is usually called Yaku or Yakuko. She is Yanineko's high school junior and uses junior-style speech. Her nickname comes from "yaku" (drugs), and she handles the drug-related humor. Like Yanineko, she lives in the Beastman House. She has pudding-style hair (dark roots) and golden eyes. While she is more diligent than Yanineko, she has a criminal record for drug offenses and still secretly manufactures and uses various drugs or smokes marijuana. When she was in prison, she was known by her inmate number, 12, and she still reacts strongly to that number today. She wants to live a straight life after her release, but most jobs she finds are manual labor, and even when she finds a decent job, she often gets fired because of her record. Naturally, she smokes and drinks. She mainly smokes rolling tobacco and Marlboro Reds.

Female. A cat beastman. Real name: Yurafuwa＊Angel Hameko. A fighting game player who broadcasts on a channel called "Hame Channel." She was Yakuneko's high school classmate. She lives in the Beastman House. She is a hardcore gamer and a fighting game addict. She is a YouTuber and always carries a selfie stick to stream even when going outside. She tries to act cute in front of her viewers, but sometimes forgets to turn off the broadcast, revealing her true nature by doing things like eating bugs during the stream. She loses her mind with rage when she loses a fighting game. To give an idea of the scale, she once lost her temper after a defeat and slammed the landlord into the ground and attacked Yakuneko, yet didn't remember a single thing she did afterward. She has brown eyes and purple hair. Surprisingly, she is a smoker, but because she has many electronic devices and games at home, she smokes heat-not-burn electronic cigarettes with low tar output. When Yanineko visited and started smoking a regular cigarette, she got furious, shouting, "Don't smoke in the room where I keep my games!"

Real name: Otani Ouya. Age 45. Male. Human. He is the landlord who manages the apartment where Yanineko and the others live. He looks scary but is a considerate person with common sense. He manages the Beastman House where Yanineko and other beastmen live. He is a 45-year-old bald, overweight man. He is a non-smoker and hates even the smell of cigarettes. He is a saint-like man who took in these cat beastmen, each of whom has a screw loose or a major problem. He is a truly kind person; considering he continues to accept Yanineko as a resident despite her constant rent arrears, rudeness, and nuisance behavior, he really is a saint. Although he is currently a bald, middle-aged man, he was quite a handsome man in his youth. Furthermore, since his original job was an office worker, he is a typical self-made success who bought the Beastman House with money he saved by working hard without parental help. He has a love-hate relationship with Yanineko.

Real name: Sato Imoko. A cat beastman. She is Yanineko's younger sister, but she is a serious and capable high school honor student. Her full name is Sato Imoko, but she is often called "Little Sister-chan." She is a beautiful girl who looks exactly like her older sister, though unlike her sister and mother, her chest is not very prominent. She has pure silver hair, red eyes, and thick eyebrows like her mother. Unlike her sister who moved out, she is still a high school student and lives with their mother. She occasionally visits Yanineko's house to look after her. She is so diligent that she takes care of Yanineko, and combined with the physical abilities unique to beastmen, she is a top-tier honor student at school. She usually doesn't show her beastman traits much and has many friends.