Bakemonogatari centers on Koyomi Araragi, a third-year high-school student who is almost human again after briefly becoming a vampire. One day, a classmate named Hitagi Senjougahara, who infamously never talks to anyone, falls down the stairs into Koyomi's arms. He discovers that Hitagi weighs next to nothing, in defiance of physics. After being threatened by her, Koyomi…