The OVA adaptation of Hyouka is created by Kyoto Animation and, like the 2012 TV anime series, it is based on Honobu Yonezawa's adolescent mystery novel Hyou-ka: You Can't Escape. The OVA is bundled on Blu-ray with the limited edition of Tasukuouna's third Hyouka manga volume, likewise based on the novel, and serves as "Episode 11.5" for the earlier TV series. The episode deals with an incident at the municipal swimming pool - in other words, fanservice abounds!