Male Navy blue hair Green eyes Usually dresses neatly. Extremely smart, diligent, and pure-hearted. He truly loves Tsukasa and is deeply considerate, though he can be a bit eccentric at times. He often hears jokes related to outer space (NASA) because of his name. A genius who once ranked first in the national mock exams.

Pink hair Reddish eyes Calm and kind. She has a certain level of charm and cuteness. She loves TV, movies, and animation. She is a great cook. She has bad sleeping habits; she always wears her hair in sheep horns when sleeping, but they always come undone.

Female White hair Light blue eyes Playful and quick-witted. She enjoys teasing people but has a lot of affection for them. She delivers mature, suggestive jokes with great timing. She frequently teases Nasa and Tsukasa about their newlywed life and plays the role of the realist who calls them out. She runs the Arisugawa Public Bathhouse (Kusatsu no Yu). When the bathhouse was on the verge of failing in the past, it prospered again thanks to Nasa's help. She feels very grateful to him. She was Nasa's junior in school. She calls Nasa "Senpai."

Female Light blue hair Pink eyes Kaname's older sister who helps run the bathhouse. She is lazy but surprisingly smart.

Female Blonde twin-tails Golden eyes Flashy dress style Possesses strong pride and deeply admires Tsukasa. She serves Tsukasa like a "Young Lady." At first, she did not acknowledge Nasa. She tried to keep Nasa in check to take Tsukasa back, but over time, she came to acknowledge him. She calls Tsukasa "Sister."

Female Blue-green hair Wears a maid outfit Lively and mischievous. One of Chitose's maids. She is often seen acting together with Aurora. She is extremely strong.

Female Brown short hair Maid-style clothing Relatively calm but has a subtle sense of humor. Acts as a duo with Charlotte. She follows Chitose faithfully.

A cute cat. Named Toast because the pattern on its back looks like a piece of toast.