Houtarou Oreki doesn�t like to do things that he considers a waste of energy. However, things start to change when he enters high school because even though he does not want to join any non-compulsory school activities, his older sister requested that he join the memberless Classic Literature Club so that it won�t get abolished. Unbeknownst to him, another student, Eru Chitanda, already planned to join; but instead of being free from club obligations, Hotaro eventually joined as he is strangely unable to refuse or escape from Eru�s passionate gaze of curiosity. Together with his friends Satoshi and Mayaka, they began to discuss a variety of mysteries in school that only Houtaro seems to be able to solve, including the mystery that lingered on from Eru�s childhood memory.