Hitagi Senjougahara

Hitagi Senjougahara is a third-year student of Naoetsu Private High School. She is considered to be a frail-looking girl with an "incurable disease" and is distant from others.

In an accidental encounter with Koyomi Araragi, her closely kept secret is exposed, and triggers a life-changing experience. In the course of the series she receives the nickname Gahara and uses the alias Senshougahara. She is the titular protagonist of three arcs: Hitagi Crab, Hitagi End, and Hitagi Rendezvous.