Theory for yandere simulator: later in the game after killing all the rivals senpai gets depressed thinking that every girl he meets will just die a horrible death and then end up commiting suicide or near the end he soon starts noticing yandere but turns her down thinking she would also die
Sometime in this month the Creator is going to be releasing a build that contains 10 rivals that's how many girls you have to deal with in the final game but I don't think they're going to be ayano rivals