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ฤดูร้อน 2008 | 1 ตอน
The OVA features six separate stories revolving around the cast, some of which border on the bizarre; one of which is an MMORPG environment being played by Konata, Kagami, Tsukasa, and Nanako Kuroi, and another in which Kagami has a "suggestive" dream about Konata. (Source: Wikipedia)
ฤดูใบไม้ผลิ 2011 | 8 ตอน
It is the start of Takatoshi Tsuda's second year as the put-upon vice president of the student council and his sister Kotomi is entering school as a first year. New friends and double entendres are made. (Source: ANN)
ฤดูใบไม้ร่วง 2011 | 1 ตอน
OVA bundled with the eleventh volume of Deadman Wonderland manga. Focuses on Senji's past, with him as the main character.
ฤดูร้อน 2012 | 6 ตอน
Bundled with the 5th, 6th, 8th, 9th, 12th and 13th limited-edition volume of the manga.
ฤดูร้อน 2018 | 1 ตอน
In the OVA's story from the manga's ninth compiled book volume, Ryūichi takes a break from the babysitter club in order to study for tests. Imitating Ryūichi as he studies, Kotarō and friends practice writing. Ryūichi wants to thank Saikawa, who helped him out during testing, and he nonchalantly tries to figure out what Saikawa likes. Ryūichi makes curry for the chairwoman and Saikawa. The OVA also includes a special "Snow White" segment based on a story from the manga's sixth volume. The chairwoman is the Queen, and Inomata is trapped in a castle doing nothing but studying as Snow White. Ryūichi is the huntsman who takes her to the outside. The babies are the seven dwarfs, and they run into Usaida in the forest. (Source: ANN)
ฤดูหนาว 2016 | 1 ตอน
The OVA featured the previously unanimated "Mad Wax" arc from the manga. Bundled with a limited edition of the manga's 20th volume.
ฤดูใบไม้ผลิ 2014 | 10 ตอน
OVAs of Seitokai Yakuindomo* which were either bundled with the limited editions of the manga volumes or as standalone OVAs.
