I'll give a shot at translating the japanese, substituting what I don't know or what could be going on. Let's see...
"This weird monster lady drowns? However, I and the child in darkness's world is living?...so choose well!"
Umm...maybe I wouldn't trust my translation very well. The moral of the story is that I need to befriend a certain boy in darkness's world in order to beat the monster lady who drowns people...wouldn't it be funny if that was actually what it said? :lol