Normal life, begone!

Nagumo Hajime is an average third-year student of Kuoh Academy, there isn't anything special about him, he doesn't have a secret power or something, he isn't part of any powerful supernatural family, all in all, he's just an average otaku, but lately, to his dismay, he's seeing strange things namely a spirit that claims to be Hajime from an alternate reality.
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This is a story about a pre-fall Hajime, meaning he is still a kind guy, in DxD universe, the post-fall Hajime will be present in spirit form, Explanation will be in the story.