The carriage is stopped by several guards at the checkpoint near the gates, as all the rest are. It just so happens that the volume of vehicles passing is much less than expected, contrary to Mizuki expectations, considering it's a festival season.
Perhaps it's because it's a closed city that it required thorough checking before passing, likely to suss out suspicious visitors or to prioritise important guests from around Astrum.
Shoma hops off her seat at the front and comes to the front, clutching a bag. She opens the door of the carriage and adds, "Step out with your things, they'll just do a quick check before letting you in," she says.
