Ryunosuke Natsume has yet to figure out that Nuku Nuku is a runaway androbot. He’s thrilled when she agrees to go with him to a match featuring Mishima Industry’s state-of-the-art robot, Sangoku Bross. The match is exciting until Sangoku Bross’ competitor, the Zweig Company robot, turns on the audience. Nuku Nuku—for reasons not even she knows—comes to Bross’ defense. Nuku Nuku finds still more mystery in when Mishima Industry’s new young president rings a bell that is hauntingly familiar. She agrees to a date with the president to discover more, but a fired executive spoils their evening with a stolen android set to kill! The president survives the attack and reveals that he wants to wake up Nuku Nuku’s evil androbot sister, R2-004, who can controls matter at an atomic level through artificial ESP abilities. Nuku Nuku, with help from Professor Higuchi, finally discovers her own identity—just in time to fight her sister to defend her loved ones.