In 1634, under the leadership of the feudal lord Date family, the people of the old compound moved to the current settlement. On the eastern plateau of the Otto River to the south of Jitsukoku Village, there are remains of a medieval settlement. The entrance from the western lowland seems to be the entrance to the citadel. What seems to be each compound has an earthwork on the east side and a cliff on the west side. Japanese basket clams: Inhabit sand and mud in brackish waters containing salt. Dioecious, transsexual. It is oviparous, and the spawning season is from late spring to early autumn. After hatching, it becomes a trochophore, and after the larval stage of Berger, it becomes a juvenile shellfish.

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