Rui Tachibana

At first, Rui was distant and emotionally reserved, often seeming abrupt and difficult to read. Her cold and reclusive demeanor made it difficult for her to socialize, and when she first appears at a social gathering, she doesn't make much of an effort to connect with others.

However, behind that cold and distant personality hides a kind, sincere, affectionate and loving girl, who only acts like this with those who are special to her, she is extremely understanding, she tends to repress her emotions but the more she relates to others, she opens up and her warmth becomes more evident.
She also tends to be playful and when something doesn't go her way she pouts and blushes easily. As the relationship progresses, she becomes more social and expresses her emotions, her transformation is gradual.