Hyōka (氷菓, lit. "ice cream") is a mystery novel by Honobu Yonezawa. It is the first volume of Classic Literature Club (古典部, Koten-bu) series. Five volumes were published between 2001 and 2010. A manga adaptation drawn by Task Ohna was serialized in Kadokawa Shoten's Monthly Shōnen Ace from January 26, 2012. A 22-episode anime adaptation produced by Kyoto Animation and directed by Yasuhiro Takemoto began airing on April 22, 2012. The first episode premiered on April 14 at a special event at Kadowaka Cinema, Shinjuku. An OVA episode, based on a plot written by the novel author, will be bundled with the third volume of the manga in January 2013.
Hōtarō Oreki is a high school boy, who always acts passively. One day, he enters "Koten Bu (Classic Literature Club)" as recommended by his elder sister.
There he meets Eru Chitanda, Satoshi Fukube and Mayaka Ibara. Chitanda is an intelligent and soft-spoken girl, but turns into an embodiment of curiosity once she says, "I'm curious!". Fukube is an ever-smiling boy with a fantastic memory, though he never deduces anything on his own. Ibara is a short girl and is strict with others and herself. She loves Fukube, but he always dodges her approaches.
They begin to investigate a case that occurred 45 years ago. Hints of the mystery are buried in an old collection of works of the former members of Koten Club. The collection is titled "Hyouka".