Two poor, married farmers have recently lost their only child; after a freak visitation, they pry open an alien cocoon to greet their new daughter.

First mainstream film directed by Genji Nakamura, based on Yasutaka Tsutsui's 1974 short story of the same title.

Momotaro carries this sword into battle against injustice in shogunate Japan. Aided by ninja he must now wage a furious battle against the terrible “Ran” clan, villains in league with Ohara Ukon, a bitter samurai nursing a grudge against the shogunate. Together the ruthless conspirators will threaten the foundations of shogunate rule over Japan. Only the relentless slashing sword of Momotaro may save the nation from the Ran clan's army of killers.