I suppose the scale of weapons we can bring to bear kinda makes demons smalltime. It could get bad if it's the type that grows larger the more it kills, but it needs a lot of growth to outdo even a tank.I’m fine if the ending is simply the demon ends up in “our” dimension.
We already have plenty of monstrosities in the form of fellow humans and arguably even more in the internet / social media, so another nutter isn’t gonna change the equation by much.
Kinda makes sense if things are crazy online too.
I suppose the scale of weapons we can bring to bear kinda makes demons smalltime. It could get bad if it's the type that grows larger the more it kills, but it needs a lot of growth to outdo even a tank.
This might be for you then. Could only find it on Mangaplus. It's called Sachi’s Records 〜Sachi’s Book of Revelation〜 so you couldn't read all the chapters. It's not exactly what you described but it is about a demon and angel trying to make this kid do bad or good things to decide what fate is for earth.I kinda want to see a manga where a demon appears in modern society ready to wreak havoc but gets depressed when they find out how outclassed they are.
Bonus points for also depressing an angel who was sent to counter the demon/save us.