The story of a deluded would-be loverboy is intiguing. Unfortunately the demo ends just as things are getting interesting. The English translation needs polish. It also took me a long time to figure out how to change into the disguise, even after gathering all of the needed items; you need more signposting there. Maybe after gathering the last item have the narrator say something like "Now I can change in the bathroom. I'll have to see how it looks."
Anyway the full game might be fun, but I'd recommend having someone assist with the English translation. Also, I was confused as to the setting. At first I thought it took place at a library, so I was puzzled why there was a party and a pool in the back. Maybe on the first screen (when the player is standing outside), put a sign on the building identifying what it is. Is it a hotel?
Some minor bugs I noticed:
-when examining the paintings on the wall, the sprites disappear
-choosing an item directly from the inventory menu results in a generic message like "You have chosen item number 9"
-the description of the security system is still in Spanish