"Amazing Three" is a science fiction drama that follows three aliens sent to survey Earth and a human boy named Shinichi, chronicling their struggle against various villains. The setting is the year 196X, a time when hydrogen bomb experiments persist and the world is engulfed in war. To determine whether to save the barbarous Earth or destroy it with an antiproton bomb, the superior beings of the Milky Way Confederation, gathered deep in space, decide to dispatch three investigators to the planet. To avoid arousing suspicion among humans, Bokko, Pukko, and Nokko—the three members of the Milky Way patrol known as the Amazing Three—transform into a rabbit, a duck, and a horse, respectively, and infiltrate a village called Ogawa-mura, located somewhere in the Japanese countryside. There, they meet Shinichi Hoshi, a wild but simple-hearted boy, and begin to run alongside him. Meanwhile, Shinichi's older brother, Koichi, is secretly involved in a fight for justice as a member of the intelligence agency "Phoenix," battling a global conspiracy—a role he has kept hidden even from his own family. Shinichi and the W3 are drawn into this conspiracy. Through their interactions with Shinichi and Koichi, the three members of W3, who initially viewed Earth as merely a barbarous planet, find their feelings gradually changing.