Kugayama Natsuki

Miya's classmate and best friend who is always willing to support her. She has a calm personality and always speak politely. She has impeccable grade and is an all-star athlete. Because of her perfection, others tend to keep their distance, and she is friendly and caring to those she breaks the ice with.
She sometimes lecture the protagonist's on the behalf of his step-sister, who cares for him deeply.
At first glance, she seems untouchable, but she has a cute side to her. She's scared of insects and reptiles, and is weak to explicit materials.