yeah like for some reason magic and stuff has always been a thing even his brother is involved like why isn't it normal in their world if it's everywhere
I'm actually more OK with that aspect. Since the Ayakashi were said to be in hiding among humans for milennia .
What I'm
not OK with, is now that outside forces (isekai) are greatly disturbing the balance, the "Ayakashi Military" equivalent aren't getting involved. Or if the fox shrine is that, and it's beyond their corrective scope -- the disruptions due to underground war between factions aren't bleeding over into "secular" reality. Triggering repercussions there.
Buildings mysteriously getting destroyed on this scale wouldn't get covered up, even with Ayakashi's power. It would start making news reports, curfews being instated, and more powerful actors (military? government?) would start getting involved. Things would get out of hand -- even for the villains.
(Unless they are pure terrorists trying to expose to secular. But then there are more straightforward ways to do that.)
That plus the super-saiyan-like "not even my final form
<asspull senzu bean>" really hurts it. There needs to be a corresponding planning time and cost for villains to pay to get their "power ups" -- equivocal to the ones the protagonist has to pay, over the course of tens (or hundreds) of chapters.
And internal plot-consistency has to been maintained why people with these sorts of
antagonistic super-powers haven't caused a ruckus and gotten involved, magically, until the moment MC appears. World-building Past and Future have to be logically contiguous.
TL;DR:
There has to be corresponding blowback if (rather with these sorts of comics "when", since "good guy always wins") their plan fails and the bad guys'
"Operation Eagle Claw" or
"Canadian Caper/Argo" fails spectacularly due to MC's life-or-death resistance.
