Hyouka anime, as a part of its 10th anniversary celebration, dropped creditless video of all of the anime’s opening and ending theme songs on Nov 18, 2022. The creditless videos will only be available for a limited time.

The opening theme for the first 11 episodes was “Yasashisa no Riyu” by ChouCho, while the first ending theme was “Madoromi no Yakusoku”. The second opening theme (from episode 12 and onwards) was “Mikansei Stride” which was sung by Saori Kodama. The second ending theme was “Kimi ni Matsuwaru Mystery”.

Both of the ending theme songs were sung by Satomi Sato and Ai Kayano.

In addition, the anime’s composer Kohei Tanaka will be present at the 10th anniversary concert of Hyouka anime taking place on Jan 29, 2022, where he will be playing piano along with Kamiyama High School Ensemble. The concert, “Hyouka TV Anime 10th Anniversary Film Concert ~Kamiyama High’s Small Recital~,” will take place at Japan Pavilion in Saitama Prefecture.

Hyouka is a Japanese anime television series based on the Classic Literature Club series written by Honobu Yonezawa. It was named after the first volume of the series, Hyouka, and made into a 22-episode televised animation series.

Hyouka was produced by Kyoto Animation, with directing by Yasuhiro Takemoto, series composition by Shoji Gatoh, and character design by Futoshi Nishiya. The opening theme played in the first half of the series was sung by ChouCho, and the opening played in the second half was sung by Saori Kodama. The ending theme of both parts of the series was sung by Satomi Satō and Ai Kayano.

The original 22 episodes were broadcast from April to September 2012. A bonus original video animation was streamed via Ustream in July 2012.

Source: Hyouka 10th Anniversary Twitter