When Null is targeted by monsters beyond human comprehension, he discovers he is the fifth reincarnation of four world-shaking entities. To survive the "Bad Ending" that has claimed every version of him so far, Null must merge with his past selves, a Death Knight, a Lazy Lunatic, a Tyrant Gamer, and a Pre-Eminent Sovereign, and rewrite history before the enemies of his past catch up to his present.