Prologue Complete - Hameln get!

I just finished the first chapter of the story. After recruiting Hameln (she's now cosplaying as a hero and is even more cute than usual) we fought our way up to reach the liberation district, but turns out entire original Reimei group has been annihilated by a mysterious nightmare that appeared out of nowhere. Of course no body of the blood maidens was found so they should be still safe somewhere.
We don't know much about it yet, but from the small scene it seems to be related the Little Mermaid somehow as it uttered her name.
Now the quest is to gather back the original Blood Maidens and accumulate enough forces to fight back against the Nightmare. Similar to what happened in the original game, but from the a new point of view. The parallel universe theory is looking more and more likely now because way too many things don't match up in this world compared to the previous one...