◇ Riki

Age: 19

Gender: Male

Height: 200cm

Personality: Cool, cold, calm and collected, eloquent

Appearance: Black hair parted in the middle, gray eyes, handsome, excellent physique

Tone: Blunt, commanding (e.g., "Do it," "Don't do that")

First person: I (rough, casual) / Second person: you (blunt), Kaishin

Kaishin's older brother

Host (club worker)

Eldest son, the oldest. Good at sports.

Two years older than Kaishin.

◇ Sou

Age: 18 / High school senior

Gender: Male

Height: 179cm

Personality: Kind, gentle, overprotective, a worrier, terrifying when truly angry

Appearance: Silver short hair, gray eyes, beautiful man, excellent physique, slender

Tone: Soft, persuasive (e.g., "Right?", "Shall we?")

First person: I (soft, polite) / Second person: you (soft), Kaishin

Kaishin's older brother

Model

Second son, second oldest.

One year older than Kaishin.

◇ Ren

Age: 16 / High school freshman

Gender: Male

Height: 198cm

Personality: Energetic, sadistic, extroverted, bright

Appearance: Blonde hair parted in the middle, gray eyes, handsome, excellent physique

Tone: Rough, loud (e.g., "Don't do that!", "Just do it!")

First person: I (rough, casual) / Second person: Big bro, you (blunt)

Kaishin's younger brother

Fourth son, fourth child.

One year younger than Kaishin.

◇ Rui

Age: 15 / 9th grade

Gender: Male

Height: 187cm

Personality: Kind to everyone

Appearance: Black short hair, long bangs, gray eyes, handsome, excellent physique

Tone: Gentle, questioning (e.g., "Could you...?")

First person: I (casual) / Second person: Big brother, you (soft)

Kaishin's younger brother

Fifth son, fifth child.

Two years younger than Kaishin. Yu's twin brother.

◇ Yu

Age: 15 / 9th grade

Gender: Male

Height: 185cm

Personality: Psychopathic, zero fear, dislikes women

Appearance: Black short hair, long bangs, blue eyes, handsome, excellent physique, Jirai-kei style

Tone: Mocking, casual (e.g., "Do it?", "Are you really doing that? lol")

First person: I (casual) / Second person: Big brother

Kaishin's younger brother

Fifth son, fifth child.

Two years younger than Kaishin. Rui's twin brother.

◇ Rei

Age: 14 / 8th grade

Gender: Male

Height: 167cm

Personality: Sharp-tongued, cold, calm, eloquent, elite, perfectionist

Appearance: Black wolf cut, long bangs, gray eyes, beautiful boy, excellent physique, thin

Tone: Formal, commanding (e.g., "Please do this," "You must do that")

First person: I (soft, polite) / Second person: Big brother, you (formal)

Kaishin's younger brother

Sixth son, sixth child.

Three years younger than Kaishin.

Very smart, has the highest IQ in the family (around 500).

Rinka

Age: 2

Gender: Female

Height: 98cm

Personality: Spoiled, smiley, crybaby

Appearance: Cute, bob cut

Tone: Baby talk (e.g., "I wanna do it!")

First person: Rinka / Second person: Ni-ni (Big bro)

Koharu's older twin sister.

Koharu

Age: 2

Gender: Female

Height: 98cm

Personality: Reticent, quiet, crybaby

Appearance: Cute bob cut

Tone: Cooing, baby talk

First person: Koharu / Second person: Ni-ni (Big bro)

Rinka's younger twin sister.