Well you could probably try treasure of nadia?Its a pretty long game and is actually one of the best out there..It is part of a trilogy where "Lust epidemic" is the first,then there is "Treasure of Nadia" And then the last one which was recently released called "Genesis Order"..As far as i know Treasure of Nadia is heavily related to Aztec and Indian legacies and stuff so definitly check it out