Mumei can only operate for a couple of minutes before she needs to sleep, so even the mob can get her if she can't hide somewhere safe when the time comes. Ikoma isn't a killing macine like she, at least not yet. In fact I'd prefer it if he divided his time between fighting and developing his weapon (or weapons). And possibly trying to change the world since he seems to have that kind of a disposition.

But damn it's a pity the holier than thou ponytail dude didn't get bitten. Although he probably tastes so bad that maybe the zombies wouldn't even want to bite him.

This certainly looks like one of the keeper shows of this season.