dndressing is set in Death Note verse Tokyo, aka Tokyo in the real world....but not quite. You see this world isn't exactly what it seems.
For instance, Light might open the door to his room only to find that he's been turned into a fluffy kitten! Or perhaps Mikami is at a restaurant, eating a delicious piece of sashimi when he realizes all of a sudden he can only speak in haikus. Or maybe Near finds himself inexplicably sitting on a rollercoaster at Spaceland. Whatever happens here, happens for no explainable reason, and the events are purely mun-driven. Whatever you want, goes. It's a musebox, have fun with it!