Soul Eater
I will rate this after I am done with other anime and stuff
I have yet to write this... because I am lazy or something
Centuries ago some psycho path figured out that if he eat human souls he would get stronger. After he eat enough human souls he turned into a "Kishin" As a Kishin he rained down chaos and suffering on the land. Well that is until Shinigami-sama stepped in and sealed this Kishin in a sack made out of the Kishin's own skin. After narrowly averting the end of the world Shinigami-sama established Shibusen.
Shibusen is a school dedicated to preventing another Kishin from rising to power. They also battle to rid the world of witches, well not really battle more like moon light. In this school there are two kinds of students, technicians, people who can see souls and weapons... well that one should be self-explanatory. Both attend school, their homework rid the world of Kishin eggs. When a team has collected 99 Kishin souls and one witch soul the weapon becomes a "Death Scythe" or the personal weapon of Shinigami-sama. And the technician.. well I think they umm.. well what the fuck do they do when their weapon becomes a Death Scythe?