This is sort of interesting
If you're looking for some rational background behind this, there's the Ophiocordyceps unilateralis, or Zombie Ant Fungi (in monkey terms). You can say it mutated due to genetic engineering that went wrong. I can't stress enough how a big fruit-anthenna that comes out of infected people's skulls sounds awesome!
This is only in case you're not insisting on bugs or anything. You can even merge the two, have a hive of some sort, with a hive queen (which will obviously be ridiculously sexy, or a little girl. Preferrably not both.) Mabye even have the fungi mutate the infected ones horribly so they become ferocious motherfuckers.
Oh man I already like your manga.
If you guys ever want another person in the team, then know that I would be totally interested :3