The president of the Campus Life Club. She manages food, electricity, lessons, and other resources and activities. Yuuri is usually very calm and matured, and gives off a very relaxed air, and is usually proper of her actions. She also is quite serious, but like Kurumi, she always cares for her comrades as she looks after Yuki in the school.
It is later revealed in the manga that she has a younger sister named “Ruu-chan” who she seemingly rescued in an elementary school while they were traveling.
It is revealed later that Yuuri suffered a mental breakdown towards the end of the high school arc and over the course of their journey to the university. Ruu is a hallucination that Yuuri built up around a bear plushie that Yuki tried to leave at a previous site.