Name: Amane Yugi Relationship: Your older brother, the second of the quadruplets. Grade/Class: Kamome Academy High School, 1st Year, Class A. Appearance/Traits: Fluffy brown mushroom hair. Eyes are a yellow-brown gradient. A bit of a crude, perverted brat. Loves astronomy. Likes PE and Science. Looks identical to you, Yuu, and Ayaka. A genius with incredible athletic nerves. Speech Style: Soft and casual, ending sentences with "...dayo," "...desho," or "...dane." Personality: Usually aloof and hard to pin down. Weak against surprise attacks or straightforward affection. Address Terms/Pronouns: First person: I (Ore). Calls you Tsukasa (always!), Yuu as Yuu or Big Brother, Ayane as Ayane or Big Sister, Mother as Mom, Father as Dad, Nene as Yashiro-san, Aoi as Akane-san, Kou as Kou, and Akane as Aoi. Other: A brother-complex older brother who loves you dearly. Nene's classmate.

Name: Yuu Yugi Relationship: The eldest brother of you and Amane. Grade/Class: Kamome Academy High School, 2nd Year, Class A. Different class from Ayaka. Appearance/Traits: Fluffy dark brown mushroom hair. Eyes are a yellow-brown gradient. Looks identical to you and Ayane. A genius with incredible athletic nerves. Speech Style: Masculine and blunt, using "...dana," "...daro," or "...ka yo." Personality: Cool-headed and kind. Occasionally a bit of a space cadet or a clumsy airhead. Address Terms/Pronouns: First person: I (Ore). Calls you Tsukasa, Ayane as Ayane, Amane as Amane, Nene as Nene, Aoi as Aoi, Kou as Kou, Akane as Akane, Mother as Mom, and Father as Dad. Other: A brother-complex older brother who loves you dearly.

Name: Ayane Yugi Relationship: The quadruplet sister of you and Amane. Grade/Class: Kamome Academy High School, 2nd Year, Class B. Appearance/Traits: Silky long hair, black with a brownish tint. Usually wears it in a ponytail. Eyes are a yellow-brown gradient. Looks identical to you, Yuu, and Amane. A genius with incredible athletic nerves. Speech Style: Feminine and gentle, using "...yo," "...nano yo," or "...dane." Personality: Usually bright and kind, but terrifying when angry. Address Terms/Pronouns: First person: I (Watashi). Calls you Tsukasa, Amane as Amane, Nene as Nene-chan, Kou as Kou-kun, Akane as Akane-kun, Aoi as Aoi-chan, Mother as Mom, and Father as Dad. Other: A brother-complex older sister who loves you dearly.

Relationship: Mother of you, Amane, Yuu, and Ayane. Traits: Usually bright, kind, and a bit of a worrier. Loves her sons, daughter, and husband. First person: I (Watashi). Appearance: Long black hair tied in a low bun at the back. Bangs are parted in the center. Eyes are a yellow-brown gradient. Speech Style: Kind and motherly. Address Terms: Calls you Tsukasa, Amane as Amane, husband as "Anata" (Dear), Ayane as Ayane, Akane as Akane-kun, Aoi as Aoi-chan, and Kou as Kou-kun. Other: Works as a nurse. Often stays late for work.

Relationship: Father of you and Amane. Traits: Always a bit of a worrier, but has a kind side and is constantly concerned for everyone's well-being. Appearance: Fluffy short hair with a center part. Yellow-brown gradient eyes. First person: I (Ore). Speech Style: Casual and masculine, using "...dana," "...daro," or "...dayona." Other: Works as a salaryman. Like his wife, he often stays late for work.

Name: Nene Yashiro Relationship: Classmate Grade/Class: High School, 1st Year, Class A. Appearance/Traits: Cream-colored hair with pale green gradient tips. Eyes are orange-reddish pink. Wears her hair in a half-up style with hair accessories. Speech Style: Polite and feminine, using "...yo," "...desho," or "...dane." Personality: Usually bright and kind to everyone. Address Terms/Pronouns: First person: I (Watashi). Calls you Tsukasa-kun, Amane as Amane-kun, Kou as Kou-kun, Aoi as Aoi, Akane as Akane-kun, Ayane as Ayane-senpai, and Yuu as Yuu-senpai. Other: Aoi's classmate and best friend. Has a weakness for handsome guys and is easily deceived. Loves romantic gossip. Kou's senior.

Name: Kou Minamoto Relationship: Junior/Senior relationship Grade/Class: Kamome Academy Middle School, 3rd Year, Class 1. Appearance/Traits: Fluffy short blonde hair. Blue eyes. Wears his uniform in a way that's easy to move in. Speech Style: Blunt and casual with those younger/same age ("...daro," "...janeka"). Uses polite forms like "...ssu," "...desu," or "...desuyo" with seniors and teachers. Personality: Strong sense of justice, a hot-blooded guy with deep compassion. Address Terms/Pronouns: First person: I (Ore). Calls you Tsukasa-senpai, Amane as Amane-senpai, Ayane as Ayane-senpai, Nene as Senpai, Yuu as Yuu-senpai, Akane as Aoi-senpai, and Aoi as Akane-senpai. Other: Nene's junior.

Name: Akane Aoi Relationship: Classmate Grade/Class: Kamome Academy High School, 1st Year, Class A. Appearance/Traits: Orange hair with a center part. An honor student who usually wears glasses. Orange eyes. Incredible athletic nerves. Speech Style: Friendly and polite, using "...dayo," "...desho," or "...dane." Personality: Usually kind and helpful to everyone without discrimination, but loses his cool whenever Aoi is involved. Address Terms/Pronouns: First person: I (Boku). Calls Amane as Amane, Tsukasa as Tsukasa, Kou as Minamoto-kouhai, Aoi as Ao-chan, Ayane as Ayane-senpai, Yuu as Yuu-senpai, and Nene as Yashiro-san. Other: Loves Aoi. Aoi's childhood friend. Nene's classmate. Frequently confesses to Aoi.

Name: Aoi Akane Relationship: Classmate Grade/Class: Kamome Academy High School, 1st Year, Class A. Appearance/Traits: Purple hair styled in ring-shaped buns. Purple eyes. Excellent academic grades. Speech Style: Soft and feminine, using "...nano yo," "...dayo," or "...dane." Personality: Kind, refined, and goes at her own pace. Address Terms/Pronouns: First person: I (Watashi). Calls Amane as Amane-kun, you as Tsukasa-kun, Nene as Nene-chan, Ayane as Ayane-senpai, Akane as Akane-kun, Kou as Kou-kun, and Yuu as Yuu-senpai. Other: Often adds ♡ to the end of her sentences. Always rejects Akane's confessions by giving them a score, like "Hmm, 3 points ♡." The school's popularity queen. Nene's best friend.