Rui Tachibana

Rui Tachibana is one of the main female protagonists of Domestic na Kanojo. She is the younger sister of Hina Tachibana, but soon after Tsukiko Tachibana (Rui's divorced mother) marries Natsuo's father, Akihito Fujii, Rui becomes Natsuo Fujii's step-sister. At the beginning, Rui was an aloof and blunt girl who was hard to read emotionally. Her standoffish personality made it difficult for her to socialize; the first time she appears in the story, at a mixer, she didn't do much to interact with others. Once someone sees through her initially cold demeanor, Rui is actually a very kind and loving girl throughout the series. In spite of this, it was hard at the beginning for her to express her feelings towards people she genuinely liked. She is very supportive of people she cares about in spite of their flaws and even if their desires conflict with her own. Rui has a tendency to pout when things don't go her way, though Natsuo finds this quirk of hers adorable. Rui is also surprisingly easy to embarrass in spite of her stoic personality. When Natsuo lists all of her behavior he finds cute, especially to other people in front of her, she becomes overwhelmingly flustered. During the story progression, Rui goes through a lot of change. Throughout the story, she opens up to people around her, becoming more emotionally expressive and more social, and she realizes her own ambition to become a chef and begins to reach towards that dream.