Yuki is one of the members of the "School Living Club". She is cheerful and very childish, and frequently acts as the motivator of the group, defusing tense situations and sometimes offering creative solutions. Yuki also comes up with fun activities to pass the time, like a sports festival or camping nights. She is shown to have a very good sense of hearing, which leads to the group coming across and rescuing Miki during their trip for supplies to the mall.

Yuki is oblivious to the fact that she is in the midst of a zombie apocalypse and the "activities" of the club are survival missions. Not wanting to disturb her already fragile mental state, the other girls go along with her ideas.
Yuki often talks to Megumi Sakura, a teacher whom she calls "Megu-nee" and who survived along with the girls. However, it is revealed that Megu-nee died protecting the girls from the infected and the one Yuki sees is a hallucination conjured up as a coping mechanism.