Getter Robo High summary: The High Beast, a mystifying monster, has seized power over Eurasia and Africa, resulting in Japan isolating itself to safeguard against this peril. The progeny of a renowned mahjong mastermind uncovers a startling truth: that monsters emerge each time a mahjong tile is struck on the board. This revelation affords humans an escape from the fight and allows mahjong experts to vanquish these creatures employing robots that respond to mahjong tactics.