My friend's been bugging me to read the manga years ago so now I can say that I "read" it. It was kind of depressing to watch though.
I'm guessing Fujino and Kyoumoto are two parts of the author (Fujimoto) and it's essentially his response to how a mangaka keeps on going. The manga was released during the Chainsawman hiatus and I'm guessing there are other references to his other past works.
Despite that, I'm still figuring out what Kyoumoto means to him. It's a silly thing to think about but assuming he's both Fujino and Kyoumoto, and he uses Fujino to represent the mangaka we know, then "who" is Kyoumoto?
Also this shot reminds me of Misato walking in the corridor:
And if anyone hasn't, definitely read Fujimoto's other one shot "Goodbye Eri".