Hyouka (氷菓?) was originally published as a mystery novel by Honobu Yonezawa, who is known for his stellar work in the Shoushimin series and a number of standalone mystery novels.
It later served as the first volume of the Classic Literature Club series and five volumes were published between the years 2001 to 2010.
A manga adaptation was later written Taskohna which were serialized in Kadokawa Shoten’s Shonen Ace magazine.
It started publishing on March 2012 and as of today, there have been 7 volumes published thus far.