is a Japanese yonkoma comedy manga series written and illustrated by Kiyohiko Azuma, which was serialized in MediaWorks' Dengeki Daioh magazine between 1999 and 2002. Three additional chapters were published in Shogakukan's Monthly Shonen Sunday in May 2009 to celebrate the manga's tenth anniversary. The manga was first released in English by ADV Manga, and was later re-issued by Yen Press.