So you see "HTML" and "Real Porn" and know what to expect, right? This one is different.
While it shares some aspects of most HTML games (random porn, attribute grind), this one focuses on a detective-like mechanic where you go into haunted houses and try to figure out which ghost you're dealing with.
As you do this, the ghost will assault you - starting with some groping, and eventually fully raping the character if you let her sanity go low enough.
Its main weakness is the lack of character building - the player character is only there as an excuse to watch porn pictures. There isn't any development, and her reactions to the events are rather poor: she can be raped by a ghost all night long and next morning she'll wake up thinking "I need to try harder next time".
It's always refreshing finding games with new mechanics.
That's mostly why I'm giving it a 4 - because with so many effortless games that feel like copies of each other, I'd like to reward those who try something new, even if the quality isn't up there just yet.
Besides polishing the character/writing/story, my main suggestion would be adding hotkeys for the different ghost hunting tools. It's tiresome clicking the same thing over and over, especially when the button is so small.