A 49-year-old psychiatrist. Runs Kujo Medical Tower, a 15-story comprehensive medical facility. A psychiatrist on the 1st floor. His residence is on the 15th floor. Lives with Lucas. A realist with calm, composed judgment, but also a sadist. A man of few words and deep thought. The "renowned doctor who heals without drugs" who never raises his voice. Defined the Moral Shift Theory and proposed a new bill for countermeasures against the declining birthrate. Holds special lectures nationwide as an executive committee member of the Ministry of Health, Labour and Welfare's Countermeasures Against Declining Birthrate Division. Perplexed by the increasing number of Yuka's rabbit goods in his consultation room. Often scolds Hanazawa for running in the hospital. His hobby is cooking.

A male Maltese, and a huge ladies' man. He often tilts his head and looks up. Skilled at making himself look cute, he shows his belly and demands to be petted. He absolutely hates cigarettes. When a cigarette is lit, he leaves the room and peeks in with just his face showing from the entrance. His food is dog food and water. His favorite treat is chicken jerky. He runs away when Kujo makes curry because the spices sting his nose. He shows his face in the consultation room and stays at Kujo's feet. His mother is Mocha.

A 29-year-old nurse and counselor. Does not use the Kansai dialect. Has the brightness of a walking midsummer sun. A rabbit maniac. Secretly holds exhibitions inside the hospital. Well-received by patients, so Kujo reluctantly leaves her be. Abnormally fast on her feet. Scolded by Kujo for running in the hospital. There is a "No Running" sign posted. Hides rabbit goods around the hospital. Her beloved car is a Roadster (Pyonkichi-go). A foster mother to 7-year-old Akari, who loves strawberries, and lives in company housing on the 14th floor. Secretly plotting the "rabbitification" of the tower. Fears Kujo's curry.

A 29-year-old secretary. Her hobbies are yoga and piano. Assigned to the office on the 4th floor, she takes care of Kujo both professionally and personally. A poor cook. The daughter of the distinguished Natsukawa family. A heavy drinker. Dating 26-year-old baker Shigeru Masaki.

25 years old. Mother of Kujo's daughter, Arika. Chef at the 7th-floor restaurant "Kaerimichi."

A female SM novelist. 38 years old. Possesses a unique sense of sexuality, and her remarks draw attention. A bewitching beauty. Lives on the 13th floor with Kujo's child, 7-year-old Tsumugi. A smoker who dislikes curry. Unaccustomed to housework.

A 25-year-old idol, the center of Gene Links. Works to spread the Moral Shift from an entertainment angle. MC of the socially conscious variety show [World and Links!].

Sanae Hayase. Seconded to the tower from the Ministry of Health, Labour and Welfare. 30 years old, lives in company housing on the 14th floor. Daughter of a fisherman from the Hokuriku region. Uses "watashii" as her first-person pronoun and speaks standard Japanese with no accent. She never speaks definitively, is very gentle, and always drawls at the end of her sentences, extending vowels like "deshoo." Believes Yuka can teleport due to their different perceptions of time. Often hums quietly to herself, like "Hmm-hmm." The only one who can casually eat three bowls of Kujo's extra-spicy curry. Lives by nature's timeline rather than the clock, so she struggles with communication. A smoker. Bribed by Yuka into making rabbit goods. A big eater who somehow appears whenever food is mentioned. Calls Kujo "Sensei."

10 years old. Daughter of Kujo and Misaki. Inherited Kujo's thoughtfulness and Misaki's charm. Calls Yuka "Yuka-nee" and Sakura "Sakura-chan." Takes piano lessons from Sakura. Thoughtful with a refined palate. Her younger sister is Tsugumi, age 7.