Japanese game developer Hideo Kojima (famous for the Metal Gear Solid series) appears as one of the outlandish ruffians killed by Azumi in the final battle.
All of Azumi's dialog is written in masculine speech, that is, speech forms that normally would not be spoken by women. This reflects the fact that she was brought up with no other women around her. Yae's remark "Girls don't speak like that!" is in response to Azumi's speech pattern. "Girls don't speak like that!" refers to Azumi saying 'Bokuwa' (the predominantly male word for referring to yourself) instead of 'Watashiwa' (the female or unisex form) when pointing out that she could hide her swords in her cloak.