Part 3/5 of the Monogatari Series' third season features the Ougi Formula, Sodachi Riddle, Sodachi Lost, and Shinobu Mail arcs from the Owarimonogatari light novels. The series follows Koyomi Araragi during his final year of high school, where he meets transfer student Ougi Oshino after being introduced by Suruga Kanbaru. Ougi has an urgent matter to discuss with Koyomi and presents a strange map of Naoetsu High School. This map leads to the unraveling of a hidden tale, ultimately changing Koyomi's high school experience forever. This story delves into the core of Koyomi and reveals the origin of everything. The first episode has a runtime of approximately 48 minutes instead of the typical 24.