Nina Nitta is a supporting character in the series. She is a classmate of the main characters and a close friend of both Umi Asanagi and Yuu Amami. Slightly taller than them, she typically wears her school uniform with her hair tied back in a ponytail with two side bangs. Her eyes are purple and her hair is brown. Nina is known for being caring toward her friends and for her straightforward, honest nature. She speaks her mind without pretense, and beneath her bluntness lies genuine devotion to those she cares about. She is perceptive and often senses when something is off, trying to manage situations or offer damage control, though her friend Yuu is sometimes too oblivious to pick up on these cues. Her background includes a tumultuous middle-school experience, which likely shaped her role as the wise and observant member of the group. Ironically, she struggles to maintain a romantic relationship herself during high school. In the story, she brings energy and sharp-tongued charm, lightening the mood and playing a key part in nudging the romantic lives of her friends forward. Her grounded and aware personality makes her a steady presence within the social circle, even though she is not the main focus of the series.