Ren was a young 24 year old from modern earth when he died in a plane crash .
he met god and was told that his death was supposed to happen much later but he was killed due to the mistake of one of the God's subordinate .
he was given a chance to reincarnate in one of the fictional worlds which actually existed in reality . ren chose naruto world without hesitation as it was his favourite.
ren was also given a system by God which would help him become strong faster . after experiencing severe pain in his soul because of system's fusion with it, ren blanked out and found himself in a new body ...
please read the novel to know the story ..