I dont want to think this is axed. I think its well proportionated. I would say that it would be unnecessary for anymore than this.
The first volume was a well done intro. Second volume was a well done middle/main part. Last volume the solve and closure.
Lately ive been enlightened that Japanese mangas are best short because after the main plot its just filler that would ruin the story.
Interestingly enough, i read this one without getting a boner at all but i really thought that Nana's outfits were beautiful. Maybe im just having a tired season rn though.