Shinigami: Gods of death

In this world, there are monsters, monsters capable of godly power the beast of calamity simply known as Yoki. Some yoki are naturally born, others are made from humans..From their greed, wrath, lust...or the souls of those who wish for vengeance. These creatures destroy, eat, and repeat. But there is a light..Slayers also known as Shinigami fight using weapons made from their or another's soul called sacred gears another name for them is sacred treasures. Or they use weapons made from dead Yoki called Teigu. Those slayers are superhuman and fight for mankind to become one you must graduate from Yggdrisal school of the gods. In said school is a boy by the name of Yn...Yn Musashi and this is his no...YOUR STORY!!!