Mineru Wachi finds Koshi Nagumo collapsed on the street from hunger and takes him to her dorm. After giving him food and he meets with the other residents including Fley. Hearing his story, Mineru proposes he lives there and works as dorm mother. Initially Atena Saotome is against it, but later agrees.
While Koshi does his chores, Fley would often call him into her room and force him to wear an outfit she made. Even when he tries to state that he is working, Fley would explain that part of his duty is to get to know the residents to make him stay.
Flay's name is based on the Norse goddess Freyja.