After a mysterious light petrifies humanity, Taiju Ooki awakens to a world overrun by nature. With the help of his genius friend Senkuu, they aim to revive civilization. However, their plans take a turn when they release the formidable Tsukasa Shishiou, whose vision for the new world conflicts with Senkuu's scientific ideals. As they clash in a struggle between progress and primal instincts, a battle for the future unfolds.