 Human settlement in the Tsuchiura area dates to the Japanese Paleolithic period.Hunter-gatherers inhabited the coastal area of the Pacific Ocean (now Lake Kasumigaura) forming large shell middens, examples of which can be seen at the Kamitakatsu archeological site.Locals began wet-rice cultivation and development of iron and bronze technology during the Yayoi period and in the Kofun period numerous Burial mounds were constructed in the area.