You buy the manga volume for the story and end up rewinding the bundled disc four times. UQ Holder has always been Ken Akamatsu playing the long game: the Mahora Academy he built in Negima grew up, magic went public, and the quiet kid from the sticks turned out to be immortal with Evangeline A.K. McDowell, hiding behind the name Yukihime, as his teacher and drill sergeant. These are the episodes packed with volumes 14, 16 and 17, made for readers who already know why Touta's grandfather-shaped shadow looms over everything and why Kuroumaru's whole situation is heavier than a running gag. No recap, no onboarding, no explaining the setting to newcomers. If you finished the Fall 2017 run still hungry for the immortal crew just existing together, you already know exactly which shelf you have to go dig through to find this.
UQ Holder! OVA is a set of three original video episodes released in 2017 alongside the UQ Holder! manga, packaged with its 14th, 16th and 17th volumes. The episodes are tied to the UQ Holder! TV anime, which aired the same year and is part of the wider Negima franchise. That series is set in a world transformed in the ten years since magic became public knowledge, and it centers on Touta, a boy raised in a remote country town far from all that change. The OVA is labeled action, fantasy and science fiction.