In Shimoyama Middle School, the Experiment Club and Karate Club each only have one member left, and as a result, must share one classroom. These two students, Sharaku Homura and Yamazaki Yousuke (a.k.a Karate Kid) together solve numerous impossible mysteries that they happen to run into! Originally a doujinshi by Nemoto Shou, now an award-winning manga, having won the Hokkaido Mystery Cross Match Award!