The main guy would go out of his way to get intimate with the girls and regularly gropes or strips them. However, it is only in situations where the girls say something like "Please bang me!" or "Why do you still have your pants on?" or the like. In other words, it would be a harem that should not offend the #MeToo crowd as all such acts are consensual and both parties stop when "Please stop!" is uttered.
Sounds like the perfect arc to have their host contract Corona. Not sure if she should be a cute loli or an busty onee-san type cell. In either case she would act harmless and start off being a passive and generous cell that liked handing everyone soup. At the end after other cells started figured out her true nature because cells started getting sick and turning into clones of Corona, she would go on the offensive by using backpack soupguns to hose down healthy cells.