Suzumiya Haruhi no Yuuutsu (2009), Hyouka Recommendations
Both shows have a similar structure and general tone. The stories are told from the perspective of a "straight-man" main character, who reluctantly gets himself involved in the shenanigans of a curiosity-stricken female lead. The supporting characters also show a number of similarities between shows, and both also offer the interesting narrative quirk of adding the main characters thoughts to spice up the dialogue. Though Haruhi is more upbeat than Hyouka, both make for a wonderfully interesting experience.