From Villages to Kingdoms

Season 2, Episode 2: From Villages to Kingdoms
Bronze spearheads from Kyushu dating to the 1-2c CE. Source: I, PHGCOM / CC BY-SA (http://creativecommons.org/licenses/by-sa/3.0/)
A Dotaku bell unearthed in Shizuoka prefecture, which is located just to the east of Kansai. Clusters of these bells buried on hilltops throughout central Honshu may have been part of a ritual to ratify alliances between clans. Source: Miguel Hermoso Cuesta / CC BY-SA (https://creativecommons.org/licenses/by-sa/4.0)
Bronze swords excavated from the Yoshinogari site. Katanas are still hundreds of years away, but these would certainly get the job done. Source: Pekachu / CC BY-SA (https://creativecommons.org/licenses/by-sa/4.0)