According to the following blogs, Medaka Box Episode 12 is apprantly a story about a shogi club in a high school.
- Medaka Box - 12 (END) | Random Curiosity
- Hanners' Anime 'Blog: Medaka Box - Episode 12 (Completed)
- Tenka Seiha » Medaka Box #12 — Blah Blah Blah Blah… » Blog Archive
- Medaka Box Episode #12 | The Anime Rambler – By Benigmatica
- Puer Magi Halfey Magica » [Review] The Melancholy of Medaka Kurokami (Medaka Boo...