User blog comment:Seieireppa/God Eater: Reverie for a Dying Star, Epilogue: Reverie for a Dying Star/@comment-1419424-20150809223908/@comment-26113680-20150810045657

He "was" the last human on earth.

Got scouted by Horizon

Aragami vanish and Humanity again arises...

Are you sure there is not more than 1 mystery? :P