The four Risono brothers, clad in powered suits as the Giant Squadron Force Man, continue their battle against Igarr, an enemy seeking to dominate the universe. Among them, Harumi Risono, as Force Yellow, faces the sudden appearance of Igarr's monster, Ebikaerugy. Harumi transforms and confronts the threat, but Ebikaerugy uses its suction-cup hands to drain her energy, tormenting Yellow. Suddenly, however, the monster halts its actions, releases Yellow, and vanishes. Though Harumi escapes the crisis, the monster's strange behavior unsettles her. Carrying growing anxiety, she prepares to face Ebikaerugy once more. Then, in a shocking revelation, the monster declares that among the four siblings, Harumi alone is not human—she is not from Earth. Stunned and thrown into confusion, Harumi spirals into turmoil, yet resolves to keep fighting and confront Ebikaerugy again. This final battle leads to a climactic encounter that brings forth a new life, culminating in a happy end.