Cursed exorcist

A teenager is trapped in endless darkness for countless centuries after he dies on Earth.
After years of loneliness and isolation, he finds himself inhabiting the body of an obese otaku. Taking this chance at a new lease on life, the teenager strives to live his life to the fullest. However, turns out life doesn't alway goes as expected

*This is an original world I came up with, the only fanfic part about is that mc will have powers similar to Mahito from JJK