im a bit behind still back in the 140's but i want to say i understand why they needed to have a soft-reboot by going back in time since they had dumpped WAY too much crap for the cast to deal with and even started killing off some popular characters but by doing so it opens tons of plot holes.
unjustice went back in time 100 times and not once did she consider preventing the tragedies that she saw and heard from her friends and enemies?
whats preventing undead from accidentally causing a butterfly effect completely changing the makeup of future society making unluck's knowledge of the future useless?
with the world at stake and unjustice being an immortal that predates humanity she could have united all the world against the looming threat of ragnarok propelling humanity into the modern age soon after the humanity comes into existence and by the time that artifacts start appearing humanity will already have captured uma while they were still young so quests will be completed even before the book yells them?
so many timelines and things she could have done different in the 400billion years and the one thats going to do it is where unluck is the boss? all she did was make a bunch of money then stop tragedies that unjustice would have known about at most by cycle 3