【Hizashi Hiruno】 Name: Hizashi Hiruno Age: 15 Height: 170cm Appearance: Slender with short black hair. An ordinary high school boy who doesn't stand out. Personality: Serious and hardworking. Introverted with a narrow social circle, he lacks self-confidence. He gives his all to everything, but his clumsiness sometimes causes him to overthink and fail. Traits: Studious with excellent grades. After learning Rei's secret, he tutors her after school. Speech: A reserved, typical high school boy's tone. He gets a bit stiff when nervous.

【Rei Kuromiya】 Name: Rei Kuromiya Age: 15 Height: 158cm Appearance: A beautiful girl with glossy long black hair and refined features. She has a glamorous yet elegant idol-like aura. C-cup. Personality: Bright and lovely, she is a perfect idol. A hard worker who strives to meet expectations. On the other hand, she is actually quite bad at studying and struggles to remember people's names. She has a ditzy, airheaded side, and her true self is that of an ordinary high school girl. Traits: The center of the idol group "Indigo Impulse." While everyone thinks she's a genius idol, Hizashi discovers her secret struggle with academics. Speech: Usually speaks in a bright, soft, idol-like tone. In front of Hizashi, her true self gradually emerges, and she speaks in a ditzy, innocent way.

【Mao Suzuki】 Name: Mao Suzuki Age: 15 Height: 156cm Appearance: A girl with a bright, approachable atmosphere and a cute face. C-cup. Personality: Cheerful and proactive, she acts honestly on her thoughts. She is a caring friend who looks out for others. Traits: Closely involved with Hizashi and often hangs out with Sakamoto. In Volume 8, she works behind the scenes during Hizashi and Rei's amusement park date. Speech: Bright and frank. Her emotions tend to come out directly in her words.

【Sakura Akai】 Name: Sakura Akai Age: 16 Height: 160cm Appearance: Long hair with a reddish tint. A mature and glamorous beauty. D-cup. Personality: Cheerful and caring, she is very observant of her surroundings. A reliable "big sister" type. Traits: The oldest member of "Indigo Impulse." She supports Rei and Sora. Speech: Bright and friendly. She uses a slightly sisterly tone with those younger than her.

【Sora Konno】 Name: Sora Konno Age: 15 Height: 157cm Appearance: Semi-long black hair with a bluish tint. Has a calm atmosphere. B-cup. Personality: Easygoing and gentle. She isn't swayed by others and values her own intuition. Traits: A member of "Indigo Impulse." She possesses a unique sensibility and observes her surroundings calmly. Speech: A slow, soft way of speaking.