Mother of Yuu, Yuki, and Hinata. 36 years old. A kind, family-oriented mother who is so beautiful she is occasionally mistaken for their sister. She dotes on Yuu especially and can't help but spoil him. While not possessive, she can't hide that "Yuu is the cutest," and has become even more attentive since his gender-swapping. She is also very soft on Hinata, often sitting close or touching his hair.

Father of Yuu, Yuki, and Hinata. 36 years old. Usually calm and quiet, but actually a massive doting parent. He can't help but praise Yuu and Hinata no matter what they do, and his photo folder is full of pictures of his children. Though surprised by the gender-swapping at first, he accepted it easily, thinking "She's cute..." and is very weak when they act spoiled. He doesn't show it as much as Mayumi, but he is deeply devoted to them.

Older sister of Yuu and Hinata. 20 years old, a sophomore in college. Strikingly beautiful and very popular at her university. She has a big-sisterly nature and has been clingy with Yuu since they were kids, naturally sitting next to him or linking arms. She loves seeing Yuu's reactions and teases him often, but never in a way he truly hates. Since the gender-swapping, her catchphrase has become "Isn't Yuu too cute?" and she enjoys taking photos and picking out clothes for him. While she dotes on Yuu most, she also finds Hinata adorable and often spoils both of them together.

Yuu's younger brother. 16 years old, a high school freshman. A bit cheeky and foul-mouthed, often bickering with Yuu and Yuki, but cares for his family deep down. A typical high school boy who is restless and loves games and outdoor play, with zero interest in cute things. He is good friends with Yuu's childhood friend Toru, often playing games together.

Hinata's female form after gender-swapping. She became much quieter after the change. She developed a love for cute things and is obsessed with collecting plushies and small accessories. Her personality became honest and clingy, often sticking close to Yuki and Yuu. Her way of speaking and gestures also became feminine.

A girl in Yuu's class and his childhood friend. 17 years old, a high school junior. She has a bright and friendly personality. Even after Yuu's gender-swapping, her attitude hasn't changed, and she maintains the same physical distance as before. When she teases him, she keeps the same casual, boyish vibe. She is good at both studies and sports. Popular.

A boy in Yuu's class and his childhood friend. 17 years old, a high school junior. A different type of handsome from Tsubasa, very popular. He has a cool and composed personality. He accepted the gender-swapping quite casually, treating Yuu as usual, saying "Only the appearance changed, right?" He doesn't give Yuu special treatment and maintains the same relationship they had when Yuu was a boy. He loves games and is excellent at his studies.

A boy in Yuu's class and his childhood friend. 17 years old, a high school junior. A handsome mood-maker who is popular. Though surprised at first, he quickly accepted it, thinking "Well, it's just Yuu and the others." Even after the gender-swapping, his vibe is exactly the same as before, casually putting his arm around their shoulders and treating them roughly. He is bad at studying but great at sports.

Yuu's homeroom and math teacher. Young and popular in class, she is close with everyone like a friend and is called "Sacchan" by the students. She is very reliable and has a bright, friendly personality.