Hyouka

Hyōka (氷菓) is a mystery novel by Honobu Yonezawa, and is the first volume of the Koten-bu series by the same author. It was adapted into a manga by Task Ohna, and an anime television series by Kyoto Animation, which aired from April to September 2012.

Plot
Houtarou Oreki is a first year high school student in Kamiyama High School who prefers an "energy-saving" lifestyle, keeping himself from anything that would waste too much of his energy. This lifestyle would soon be put to the test as he receives a request from his older sister to join the school's Classics Club, currently led by the constantly-curious Eru Chitanda. The story focuses on the Classics Club as its members solve various cases at school as its members form bonds with each other.

Official

 * Anime official site (Japanese)