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".
I've seen I Want to Eat Your Pancreas. Kimisui (the short title, because it's so long lol) kind of feels like getting stabbed in the chest then it's over. Like what @wjs018@ani.social said, Look Back wasn't top tier emotional, at least in the same sense as Kimisui.
Kimisui / Look Back spoilers
Kimisui banks on the audience's anticipation on when Yamauchi dies because it's pre-established that she does die (movie opens with her funeral). The twist takes a different form. There's also the reveal of the main character's name. After Yamauchi dies and the MC goes through a cathartic moment, life goes on for him.
In Look Back, I kept thinking to myself "oh it's not over yet?" There are several moments after the "twist" when I thought the movie was going to end already but it kept going (for good reasons) so the emotion you feel is a bit different. Perhaps a bit dull. Maybe you can say Look Back doesn't have a "climax" in the same way Kimisui does.
Also, Kimisui is grounded completely on reality while Look Back has a segment where two timelines converge. So maybe the realism in Kimisui makes it more emotional.