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ฤดูร้อน 2013 | 2 ตอน
Two OVA episodes bundled with the 16th volume of the manga. One of the included episodes is based on the story from the 15th volume, while the other contain an all-new original story. (Source: ANN)
ฤดูร้อน 2012 | 1 ตอน
Episode 11.5, an OVA bundled with the third volume of the manga. Oreki Houtarou gets a job at a swimming pool.
ฤดูร้อน 2010 | 1 ตอน
On her first day of junior high school, Mato Kuroi meets Yomi Takanashi. Though Yomi is initially taken aback by Mako's straightforward personality, the pair quickly becomes friends and begin to spend time together daily. As a sign of their friendship, Mato gives Yomi a cell phone charm—a blue star, identical to her own. However, when the two enter their second year, their relationship starts to change. Placed in a different class, Mato begins to spend more time with Yuu Koutari instead, a girl she met through the basketball team. In fact, the former best friends drift apart so much so that Mato cannot find Yomi anywhere, as if she had disappeared entirely. Elsewhere, Black★Rock Shooter is on a quest to vanquish the Dead Master. These two, while opposed, bear a connection not unlike Mato and Yomi. As their stories begin to cross, it seems Yomi's disappearance may have to do with the blue star-shaped charm and the legendary gunslinger herself. [Written by MAL Rewrite]
ฤดูใบไม้ร่วง 2010 | 1 ตอน
A short OVA that was bundled with the limited edition of the eleventh volume of the manga.
ฤดูใบไม้ผลิ 2005 | 1 ตอน
Having been accepted into the Kaede Inn, Nana struggles to find some way to contribute, though she inadvertently brings more trouble than assistance. However, Nana's worries are directed more towards fellow resident Nyu, whom she had only known as Lucy, the violent Diclonius. Fearful that Nyu will unleash the same horrific savagery—violence that scars Nana to this day—upon those close to her, Nana faces a dilemma: attempt to live peacefully alongside Lucy with all the uncertainty that that entails or dispose of the source of her worries, shattering the relationships she has formed at the inn. As Nana struggles to come to a decision, Nyu recalls a painful memory of one of her dearest friends and one of her greatest rivals. [Written by MAL Rewrite]
ฤดูใบไม้ผลิ 2011 | 5 ตอน
OVAs bundled with the special edition of the 26th, 27th, 31st, 35th and 38th volumes of the manga.
ฤดูหนาว 2010 | 1 ตอน
Afterschool Teatime performs live on New Year's Eve.
