This was really good (and much longer than I expected despite the number of pairings since I'm on mobile). It was a bit weird to see different settings one after the other though - as far as I could tell, each of the stories takes place in their own continuity.
Onto the pairings, I was surprised at how much I liked all of them. I am also a bit disappointed that there was no Io x Rosetta, since Mikanuji is like one of two people that ship. Speaking of pairings, wasn't the second story's pairing Vira x Farrah? I'm pretty sure that wasn't Djeeta, in any case.
I'm pretty sure, with the art shown between each chapter, that this is a collection of Mikanuji's previously released Granblue doujins in one massive omnibus doujin, so changes in setting and pairing and all that would make sense.
As for that pairing, I actually asked around with some Granblue fans and stuff, and no-one had any idea who that character was in the second story, so I just left it untagged until someone could find out. Djeeta x Vira is for their presence in the last two stories.