Soul Eater is a Japanese manga series written and illustrated by Atsushi Ōkubo. Set at the "Death Weapon Meister Academy", the series revolves around three teams, each consisting of a weapon meister and (at least one) weapon that can transform into a humanoid. Trying to make the latter a "death scythe" and thus fit for use by the academy's headmaster Shinigami, the personification of death, they must collect the souls of 99 evil humans and one witch, in that order; otherwise, they will have to start all over again. 

The manga was published by Square Enix, and was first released in 2003 as three separate one-shots; the first two published in two Gangan Powered special editions and the last one in Gangan Wing. The manga was then regular serialized in Square Enix's Monthly Shōnen Gangan magazine from May 2004 to August 2013.