The stone circle arrangements were built in the middle part of the late Jōmon period (approx. 3,500 years ago). The stone circle arrangements 90 m north of the Manza stone circle are large and considering the findings of stone fireplaces and numerous pillar pits, the buildings were likely big too. Eleven stone circle arrangements in the range of 5–14 m have been discovered. Of these, six arrangements near the northern border of the Manza stone circle are distributed in a circle with a diameter of approximately 50 m, which shows that they had a special preference for rings by this time. These stone circle arrangements are accompanied by floor fireplaces and pillar pits, which makes them look like stone-floor dwellings, but the buildings were likely for festival or prayer purposes.