Recently you've been hired to work in the Scarlet Devil Mansion. You've been working for a little while, and everything's normal on the surface.

However, you haven't noticed something: pretty much every inhabitant of the mansion(Remilia, Patchouli, Sakuya, Meiling, Flandre and Koakuma) is interested in you.

Now, today you have finally finished work early, so you can do whatever you want... or at least what you want inside the mansion.