I had a dream where I thought I was watching Kimetsu no Yaiba, except I haven't actually watched Kimetsu no Yaiba so what I've come up with in my dream may actually be totally original, here's the plot

>on a bus travelling through the countryside
>there are 3 other people on the bus, the team 7 esque band of main characters, they're all bantering with eachother and being kind of dumb
>the bus stops to pick someone up and pic related walks on
>everyone knows him as the super cool angsty badass who had just destroyed an entire major city
>in this world people have acquired powers, akin to cards in their pocket, they can accumulate as many of these as they are able, each one requires some sort of battle or challenge to get, and all are completely unique
>they ask him how he defeated major city
>he lists off his powers, he has 7 of them, all extremely powerful ranging from being able to create nuclear missiles, earthquakes, and to shield himself inside an impenetrable fortress if attack
>but desite all this power he says "but it's not enough, I am still too weak"
>the 3 other guys are confused as to how this guy could think he is too weak
>Also in this world there is a mechanic where everyone is assigned to one other person, someone who is older and stronger than they are and can at any moment if they wish, summmon them and fight them to the death
>"<stronger guy> could summon me at any moment, I am not ready!" he says, obviously this other guy is even stronger than this guy, and he says this with an uncharacterist sheepishness in his voice, betraying his otherwise cool demeaner.
>he then gets off the bus at his stop and carries on

Are the manga ideas of my dreams interesting or is my brain a talentless hack?