It's a fan made video game, based on another. It's a RPG, you can find it subbed on Youtube.
Basically, everyone gets trapped in a house with a monster, and everyone keeps dying so Italy keeps reversing time to try and save everyone. Everyone dies at least once, and England over uses his magic.
HetaOni 1 - Part 1/2 [ENG / DAN / FRA / ITA / POL / POR subs] - YouTube