In some cultures or areas, they eat sushi roll with facing to the lucky direction at the end of the winter. But the direction changes every year, so usually they have to search the correct direction each time. By this app, you can know the right direction. First, please choose the year from the list, then the indication written on the face of the mask will let you know the lucky direction on that year.
Additionally, you can see where you are now on the map and change the zoom level by tapping a zoom button on the lower side of the screen.