Yandere happens to be a Japanese character type who is willing to go to great lengths for the one whom she loves, and this would include crimes such as kidnapping, or on an even more heinous note – murdering. This is certainly a character archetypes that is not too common, but I suppose there is a place or market for such a character, otherwise a title like Yandere Simulator would definitely not have been made.
Yandere Simulator happens to be a brainchild of a programmer who goes by the moniker YandereDev, who used to work at a game company before, tinkering with console and mobile titles. Definitely a work in progress at the moment, it remains to be seen whether Yandere Simulator will make it big when it arrives – it certainly has an air of sensationalism for sure.