Thats hard, i'd say danganronpa. 11037% sure. I watched/played every part except 0 and the ova, and i gotta say, danganronpa is good (though i really hate the devs due to chapter 3 of udg, haiji towa, kyoko in chapter 2, miu, and pretty much everything bad in the sense of unnacceptable, so at the same time, demon slayer is better,) BUT A BETTER KILLING GAME IS YTTD