Cursed Zero: Negative

[This is the prequel to my book Cursed Zero, you should 100% read this before you start it. Once you've started reading this, don't switch to Cursed Zero, you'll confuse yourself]

Once every one thousand years there is an event known as the Soul Parade occurs during the month of October were creatures known as yūrei appear. And it's up to a special group of people known as exorcist to stop them. And one of them is a boy name Soya, who is dragged into this when a bounty is put on his head and he is saved by the strongest exorcist, Sora Senju. Now Soya must help save the world from being consumed by yūrei