His arrival on Halo Installation 04 was an honest to Kami accident but if asked he'd say his luck sucked. But perhaps it was fortune smiling upon the Reclaimers that he had shown up as he was about to tear the Covenant a new one. A very big new one

The last thing he remembered was fighting Kaguya but now he has somehow found himself seventeen years in the past right on the night he was born. With the way things where going during the Fourth Shinobi World War change he feels a little change is in order. lets see whether his presence in the past will be what is needed to make all the difference in the end. Butterfly effect.