Pervert Action: Timelapse - Version 0.80 by BBBen Win/Linux.Mac - Adult Sex Game

Shuji has lost the last month of his life. Now he finds in that time he's been dating a group of gorgeous, out-of-his-league girlfriends. What happened in that time? Choose how you build your skills and which women you’ll focus on, as you date the girls in order to unravel the mystery.
This edition, titled "The First Day" includes the full first day of the story, introducing much (but not all!) of the cast.

Entering the codes: Go to the entrance room of the apartment (this will only work once you can start navigating around the apartment with the mini-map) and click on the closet that opens a little when you hover over it. A box will pop up and you'll need to click on the letters to enter them.