It's a bit complex. Originally the whole series was collected in 13 tankoubons, but the raws are taken from a Kazenban edition with more chapters and extras per volume collected in only 9 tanks.
But it's essentially the same chapters.
One day, when there's a hundred episodes or something, I'll reread the whole thing and I'll enjoy these little side stories. But now they're just cutting the action.
Damn, what's with all this dust getting in my eyes and giving me some sort of allergy htat makes them super puffy and leaking. I should clean this place better.