In Hunter's Harem you play as Hunter (name changeable) who one day recieves a package from his dead uncle. In there he finds a mysterious book of magic spells, the first of which allows him to magically hypnotize, enslave and transform the people around him.
The game allows the player a certain amount of freedom as there is no particular order you have to do things (visit places, enslave characters, fuck characters, etc.). There are some actions that have certain requisits, though.
It features lots of pictures and mp4s.