A 2006-current manga by Katou Haruaki, serialized in SoftBank's FlexComix Blood, and adapted into a Fall 2008 anime by Nippon Animation. A visual novel based on the anime named Hyakko: Yorozuya Jikenbo! was released on April 9, 2009.
The series follows the comedic lives of four high school students in Kamizono Academy.