I think it’s important to mention an observation I’ve had recently, it would appear that every single time Nano gets either a weapon or is put in a position of battle, the series switches genre for a brief bit. She turns this rom-com into an action thriller at the drop of a hat. That’s just who she is, a cool beauty that can and will kick your ass if need be.
A part of me is surprised there wasn’t any references to the original zombie arc, the “kissing zombies” arc specifically, since they all have to bite each other to be turned. This was a prime opportunity to have a mention of the first event, then again Hakari and Karane have made a point to pretend as if they have no memory of the event to begin with.