Koyomi Araragi wakes in the depths of Avici, the lowest level of hell, where he reunites with the ghost girl Mayoi Hachikuji, who helps him find a way back to the living. Upon his return, he and Hitagi Senjougahara share a belated White Day date before oddity specialist Izuko Gaen summons him to Namishiro Park for one last reckoning with Ougi Oshino. This three-arc special concludes the main Monogatari storyline.