>>82875535
I don't really have any videos that I can think of, but I can link you to some stuff on electric bacteria. This a more informative video, but it covers some very peculiar electric bacteria that make long(for bacteria) cables. https://www.youtube.com/watch?v=LRvSiwXKGIo
Otherwise it'd be more along the lines of ecospheres. Although, since it'd be in the dark, it wouldn't need to be sealed up(and in fact would likely prefer to not be for gas exchange). You'd expect little scuds and snails to eat the bacterial film and everything else to go from there.

Honestly, I would've figured that you'd have wanted to make more romance oriented VNs for some reason. That's an interesting idea for a story too, especially if the guy is actually good at cleaning up evidence. You seem plenty intelligent also, but you should definitely research topics related to what you want to make. Doesn't need to be perfect or super realistic, but it helps to give a bit of accuracy and you might discover some cool things you can twist and use B^).

What makes you think you'd do poorly on dialogue though?