Hyouka Episode 6: Committing a Cardinal Sin
Episode 6 of 22 of Hyouka, aired May 27, 2012, 26 minutes. Available with English subtitles and dub where released.
Episode summary
Hotaro's history class is interrupted by an outburst coming from Eru's math class, prompting a discussion in the Classic Lit Club about the nature of the seven deadly sins, and what might provoke Eru to become angry.