Following an encounter with oddity specialist Izuko Gaen, third-year high school student Koyomi Araragi wakes up in a strange, deserted void only to be greeted by a joyfully familiar face in an alarmingly unfamiliar place. Araragi, with the help of his girlfriend Hitagi Senjougahara, maneuvers through the webs of his past and the perplexities of the present in search of answers. However, fate once again delivers him...