Blending in with the historic townscape of Otaru, '□○ (Kakumaru) Do' is a specialty store that deals in natural stones and accessories. The store, housed in a renovated stone warehouse from the early Meiji period, displays a variety of colorful natural stones and original items combining them with Otaru-style glasswork. It is a popular spot where you can also experience making your own bracelet, allowing you to create a tangible memory of your trip.