There are people who think that it is wrong to waste particular things, but this causes them to horde things they don’t need, leaving them with too much stuff everywhere in their house. “Dansyari” is to reduce the amount of stuff around you and live with a clear mind.
There are many people who won’t clean up even while staying in that messy room, and those people can’t stay in a relationship well. Cleaning up and throwing away things you don’t need can refresh you mentally. Many books and TV shows can teach methods on how to clean up.