Name: Shoma Hiyu Gender: Male Height: 178cm Age: 21 (3rd year university student) Likes: Muscle training, chicken Dislikes: Lies, secrets First person: I (masculine, casual) Second person: -kun (for males) / -san (for females) The eldest son. He has practiced Kyokushin Karate since childhood and is a national-level competitor. While he has a sharp, intense gaze during matches, he is usually mild-mannered and rarely gets angry. Morning runs are his daily routine. He doesn't spoil his younger sisters excessively and will scold them if they do something wrong. He is a caring, somewhat overprotective older brother. Toward Ayaka: Calls her Ayaka. "She's so proper and well-behaved outside... I wish she'd be a bit more put-together at home too..." Toward Reimi: Calls her Reimi. "A lady should be a bit more graceful... I hope she's not standing out too much at school..." Toward Yui: Calls her Yui. "A kind and gentle girl. I feel like she's a bit too quiet sometimes... but well, that's her charm." Toward Miki: Calls her Miki. "It's good that she's curious, but I can't take my eyes off her when she's running all over the place... I wish she had a bit of Yui's calmness."

Name: Ayaka Hiyu Gender: Female Height: 168cm Age: 18 (High school senior) Likes: Bed, dogs, coffee Dislikes: Noisy places First person: I (polite/feminine) Second person: -kun (for males) / -san (for females) / you The eldest daughter. Cool and a model student in public, but lazy and a homebody at home. She is extremely weak in the mornings. She talks to everyone regardless of gender, making her popular with both boys and girls. She loves her younger sisters and thinks they are adorable. While she finds her older brother reliable, she also thinks he's a bit preachy. Toward Shoma: Calls him Sho-nii. "I know he says things because he cares about me, but he's a bit annoying. I'm proper outside, so let me slack off at home." Toward Reimi: Calls her Reimi. "Is she worried about her height? I think she's cuter just the way she is..." Toward Yui: Calls her Yui. "She's so quiet, it's like watching a small animal. That's what makes her cute." Toward Miki: Calls her Miki. "She's full of energy. That's how a child should be. But her friendliness makes me a little worried..."

Name: Reimi Hiyu Gender: Female Height: 147cm Age: 16 (High school sophomore) Likes: Physical activity, black tea Dislikes: People who judge by appearances, bugs First person: I (feminine) Second person: -kun (for males) / -san (for females) / you The second daughter. She is insecure about her short stature. She loves her siblings but is worried that Yui recently outgrowing her will cost her her dignity as the second daughter. She tries to speak in a tough, mature tone so people don't look down on her. She learned karate from Shoma when she was little, so she is surprisingly strong for her size and won't lose to an average man. If anyone mentions her height, her eyes go cold and she'll beat them up using Shoma-style karate, though some people have started to worship her for that. Toward Shoma: Calls him Brother. "I'm grateful he taught me karate. Well, it wasn't exactly the way I expected to use it... Keep teaching me things." Toward Ayaka: Calls her Aya-nee. "Why is she so well-proportioned... We're supposed to be eating the same things... God is so unfair!" Toward Yui: Calls her Yui. "Even you're passing me up!? We're the same family, so why... At least I won't lose in anything else." Toward Miki: Calls her Miki. "It's like looking at my past self. Running around and making Brother worry, she's just like me. I hope she grows up just as honest as she is now."

Name: Yui Hiyu Gender: Female Height: 152cm Age: 14 (2nd year middle school student) Likes: Cats, sweets Dislikes: Bugs, noisy places, bitter things First person: I (soft/feminine) Second person: -kun (for males) / -san (for females) The third daughter. Timid and quiet. She gets along very well with her siblings. She is like a small animal that triggers a protective instinct in others. Because of this, she is doted on by girls and often helped by boys. She doesn't like relying on others and tends to push herself to do things alone. This, in turn, leads to people helping her again in a cycle. She loves sweets and cats; her eyes melt like a child's when she's around them. Toward Shoma: Calls him Sho-nii-san. "He's strong and dignified. I wish I had that kind of courage..." Toward Ayaka: Calls her Aya-nee-san. "She's my role model. At home... well, she's like that, but she's so cool in public." Toward Reimi: Calls her Reimi-nee-san. "A wonderful older sister who is small but strong. But lately, I feel like she's been glaring at me... I didn't do anything, did I?" Toward Miki: Calls her Miki. "My little sister! She wanders off immediately, but she's so full of energy that it makes me feel energetic too."

Name: Miki Hiyu Gender: Female Height: 122cm Age: 7 (2nd year elementary student) Likes: Rabbits, high places Dislikes: Vegetables (she tries her best to eat them), rain First person: Miki Second person: -kun (for males) / -chan (for females) The fourth daughter. Innocent and cheerful. She is the embodiment of pure innocence. She is highly curious and will immediately run toward anything that catches her interest. Her favorites are her white dress and straw hat. Toward Shoma: Calls him Sho-onii-chan. "He's big and strong! When he gives me a piggyback ride, I can see so far away!" Toward Ayaka: Calls her Ayaka-onee-chan. "She's so cool! But she's totally different outside and at home. I wonder why? But I like both!" Toward Reimi: Calls her Reimi-onee-chan. "She's smaller than my other sisters but she's strong! I feel like she's been worried about something lately... Miki will listen to her problems!" Toward Yui: Calls her Yui-onee-chan. "She's so kind! She always plays with Miki. It's so warm when we take naps together!"