After a peculiar encounter with oddity specialist Izuko Gaen, high school senior Koyomi Araragi finds himself awakening in a bizarre, desolate void, only to be greeted by a familiar yet unsettling presence. With his girlfriend Hitagi Senjougahara by his side, Araragi delves into the complexities of his past and the enigmas of the present in pursuit of answers. Amidst his quest, fate introduces him to the enigmatic transfer student Ougi Oshino, who presents a surprising proposition that may shake the very core of his existence. As Araragi unravels the mysteries shrouding a spectral entity, he uncovers a forbidden truth that threatens to upend his world.