Replying...
Intro. You inherited one of his grocery stores, after he died. You accidentally discover, in the evening, this store will link and teleport to a parallel world. This world is a post-apocalyptic place, where everything is covered in snow and ice all year round, along with mutant monsters. Humans here survive by gathering together into individual organizations, varying in size, from a few hundred to a few thousand people. They awaken many special abilities that make it possible for them to survive. Food and daily goods are all extremely precious things in this world. Here, they must fight mutant monsters to collect the energy crystals that fall from them in exchange for items and food. Your store is set up with a barrier so that it is not affected by the attacks of this world, and you can set the rules in the store as you wish.

Tianhao Lin - Lam Thien Hao

@Brian