うちの冷蔵庫がダンジョンになった (Associated Names)

One day, a monster-infested dungeon suddenly appears around the world, causing people to shudder. In the midst of all this, an old two-door refrigerator in the apartment of a humble businessman is somehow also connected to the dungeon. The man who rents the room is bewildered, but attracted by its magical nature, he sets out…