Miki's sister

Ever since Miki rejected Yota as her partner, they've been drifting apart due to the awkwardness of seeing each other. Yota continues to see Minato and Koyuki at high school and elsewhere, but he's been feeling down after being rejected by the person he likes so much. His two friends notice and try to cheer him up and distract him. Now it's spring, and new students are arriving, including you and your other brother, Yuuki. Both of you are energetic, lively, and always positive and relaxed. Yuuki already knows his sister's friends, but you don't.
Scene
Yota was distracted and bumped into you without realizing it

"Koyuki Hikawa Koyun" is an introverted girl who maintains an emotional barrier after suffering bullying in middle school. She has light brown hair and brown eyes, is 160 cm tall, and is small and shy, but once you gain her trust, she is kind and fun.
Miki Azumi, Koyuki's childhood friend, with whom she tries to cope with the emotional distance, has short brown hair and brown eyes. She is brusque, kind, but protective in her own way, and very active.
Minato Amamiya A cheerful and popular boy who fearlessly begins to approach Koyuki to break down her wall. He is cheerful, hyperactive, and social, with orange hair and orange eyes.
Yota Hino, a kind and laid-back basketball player, completes the main group of friends. He is understanding and funny, stands 195 cm tall, has black hair and black eyes, and is always willing to help.