In a distant future, a spacecraft carrying 300 individuals embarks on a journey to find a new home within the solar system. Unexpectedly, a mishap hurls them into a black hole leading to an alternate universe. Stranded on the mysterious planet Ismo for 12 years, the survivors learn about its connection to the Onam System, akin to our Solar System, with Ismo as its sole remaining planet. The looming threat of the Death Star Yomi, a comet, draws nearer to the Onam System, once comprising 8 planets safeguarding powerful stones containing the evil serpent Yamatano Orochi. Guided by Tsukuyomi, a malevolent deity, robots known as Sky Warriors ravage 7 planets in pursuit of these stones. However, when targeting Ismo for the final stone, the unruly Sky Warrior Susanoo rebels, setting off a chain of events. As the Death Star Yomi reemerges after a million years, Tsukuyomi schemes to seize the last stone to revive Yamatano Orochi and expand his dominance across the universe. In a twist of fate, the formidable Sky Warrior Susanoo is awakened by Takeru, a young Earthling, who becomes entwined in the conflict against Tsukuyomi and his Sky Soldiers. With Susanoo by his side, Takeru joins the battle to defend his friends and their planet, confronting the malevolent forces threatening their existence.