Shops

Shops attract tourists, they also provide experience and gold. Shops can be upgraded by having shop sales. When having shop sales, you earn EXP. To level up your shops, you need to gain enough EXP. Then, you will see an "Arrow Up" Icon slightly above the shop to allow you to level up your shop to next level.

Credits goes to:

http://wikiwiki.jp/japanlifeapp/?%A4%AA%C5%B9