W...

What the hell~!?

The infected old men now roam around and think only of devouring girls. They've transformed into abnormally tough zombies.

If you lower your guard near them, you will get infected and won't be able to resist their penises!!

...Youkai getting infected sounds worrisome.

But wouldn't it be easier to just bomb the zombies from afar?

That's correct, but there's a risk of infection through bodily fluids.