@IpoNokaoi, I saw what you did there! 
It looks like there’s a tan house in the background that has proper slope for an insulated roof in that climate, and a more traditional house to the right that hasn’t had modern insulation put in, so the snow’s melted off before accumulating. These guys are shoveling because they put modern insulation under roof built without it, is what I’m guessing.
I love the “deep eaves, no gutters” tradition in Japanese architecture. So much more elegant than western European roof drainage systems!
