Chihiro Chimatsuri

A beautiful lady who is the Seijumonji High School nurse and the Chimatsuri Blood Research Institute director. Although she is wild and has a tendency to swear, she is kind at heart.

She becomes interested in Mai (especially her blood) and supports Mitsugu.

She creates a Blood Donation Club at school and becomes its advisor to gather food for Mai and collect rare blood to pursue her own interest.

(Source: Anime News Network)