The Adventurer's Guild building looks the same as it did last time! It's as if there weren't any major renovations since then.
After temporarily stabling their horses and being directed to the appropriate office, Haroun explains what the two of them want to do. Bella is interested in joining permanently and is looking for a provisional license so she can enter the nearby dungeon and get enough loot for a proper tinplate. She's strong enough to protect Haroun and wants him along for, uh, personal reasons, so Haroun needs a one-time guided entry permit. There's some skepticism from the official and well-meant warnings about the unwisdom of going into a dungeon accompanied by somebody who isn't a full Adventurer. Haroun tries to convey that he understands all the obvious reasons why this is a terrible idea and he is very firmly set on doing it anyways.
Ultimately, the official relents. This isn't Earth; the Adventurer's Guild is not concerned about lawsuits and liability and they will ultimately let you commit suicide if you are bent on doing that. Their job is to make more Adventurers and collect more fees from them, not keep would-be applicants safe.
The official asks Bella to donate one drop of blood, into a small crystal pipette set with glowing runes too tiny to read. If Bella's sword isn't currently sterile enough for her to perforate herself, an intrinsically sterile dagger can be supplied for her. (Obviously, an Adventurer capable of protecting this innocent boy-student will have the skills to use sharp objects, right?)