I wouldn't want you to be disappointed, so I'll chime in.
That would be a perfect example of what makes the three-letter tag so hated even over other "worse" tags. Games with no hint of it getting it dropped in. Lucky RobertDeath has made it clear that won't happen, but it so often does. No other tag has that happen. No one drops unexpected necrophilia or bestiality in a game without warning mid-way into the game's life.
I chimed in, so now no one else needs to.
As a slightly more on topic comment, having a zombie apocalypse (or some other disaster) be the reason the harem continues could be funny. I do hope the harem keeps going after the show ends or that whatever the overall plot is it is one that makes the harem keep going. We know something more is going on, and it would be kind of interesting if it was someone (Richard maybe) knowing the world is ending so he set this up to help save humanity through the characters in the show.