The "Final" designation in your search typically refers to a completed version, a compilation, or the definitive edition of the game, which was originally released around 2015.
Because this is an adult-oriented "training" and "voyeurism" simulation game, the following piece explores its themes, mechanics, and its notorious reputation within the niche genre of visual novels.
: The game focuses on observing characters (often in a "No. 509" room setting) as its primary gameplay mechanic.