The Disappearance

Here there is a family of six, you will get to know them more soon enough, they live in an apartment in London, which is supposed to be abandoned, with three bedrooms and three bathrooms. One more room would be a particularly odd room with thirteen mirrors. In this family of six, there is the mom who is 35, the dad who is 36, the oldest who is 13, the second oldest who is 10, the middle child who is 6, and the youngest who is 3. Oh, and their apartment number is nine.

(I might not often update so sorry in advance)
With just a little side note or 2,
A way this is different from Danganropa is that it's in an apartment complex and there is NO ULTIMATES, the people that are in this game are regular people who were dragged into it for this family's sadistic fun. There is also no apocalypse like in Danganropa and even more, interestingly everyone who was forced to participate remembers their past.

because they are all trapped in an apartment building they have limited resources that DON'T get restocked by someone like Monokuma, and if you're wondering there is NO version of Monokuma in this story because this family is first introduced don't need to make something like him, because they wanted to be in it themselves and experience what they think the truest form of human nature is which in this case is torture and agony, don't forget the pain.