Owarimonogatari (終物語) is the 7th Monogatari Series anime adaptation from Studio Shaft. The series was released in two separate cours that released two years apart from each other. The first cour adapts the first two volumes of Owarimonogatari, while the second adapts the final third volume.
The first cour aired from October 3, 2015 to December 19 with a total of 12 episodes. Technically, there is 13 episodes as the first two originally aired as an hour long special. The special is separated in the blu-ray release, but kept whole on most legal streaming sites, changing the episode number names.
The continuation, adapting the remaining third volume, aired as a two-day special on August 12th - 13th 2017 with a total of 7 episodes.
Owarimonogatari is the first adaption to be released in blu-ray volumes in North America. Note, the western blu-ray volumes are split into three volumes the same way as the novel version, so the second cour is referred to as "Volume 3" in this release.
The first cour of the anime series adapts the first 2 books of the light novels, which contain the stories Ougi Formula, Sodachi Riddle, Sodachi Lost and Shinobu Mail.
Ougi Formula takes the first episode as a one-hour special. Sodachi Riddle covers episodes 3 and 2, Sodachi Lost for episodes 4 to 6, and finally Shinobu Mail covers the final half of the show, as episodes 7 to 12.
The second release adapts the final volume, containing Mayoi Hell, Hitagi Rendezvous, and Ougi Dark.
In the first half, Koyomi Araragi is introduced to Ougi Oshino who requests him to help her with a mystery regarding a certain room in the school, which eventually leads to him remembering an important person from his past. In the second half, Koyomi and Suruga Kanbaru agree to help Izuko Gaen with a special task when a mysterious being in samurai armor arrives demanding his Kokorowatari be returned to him.
Koyomi finds himself reunited with Mayoi Hachikuji on the day of his college exam. She explains that he's fallen down into the deepest part of hell. After he returns from Hell, him and Hitagi Senjougahara go on a date on White Day. In the final arc, Gaen requests to meet him at Namishiro Park to reveal her plan to confront the enemy that's been causing all the recent trouble in town.
Note: For the first cour, due to the original release having the first episodes combined as a special, they share a page but are considered two separate episodes. The proceeding episodes listed follow the blu-ray episode numbers, not those found on most streaming sites.
For the second cour, every episode was released over the course of two days, with the first day having 4 episodes worth and the second having 3 episodes worth. Streaming sites have each arc as its own episode to make a total of three parts. Here, the episodes are split as they are in the blu-ray.
Kei Haneoka returns for the third time to produce the series soundtrack.
The first cour of the series introduces four opening songs, one for each story arc barring Sodachi Lost, which shared opening with Sodachi Riddle during the TV run. The blu-ray release includes an exclusive opening for Sodachi Lost.