Fifty years after the Earth Expansion, humanity embarks on a daring mission to remap the world! Second-Grade Pioneer Ryusei Kuroki and his loyal Pomeranian partner, Pomukichi, are investigating uncharted lands outside Tokyo when a strange phenomenon suddenly transports them to Yokohama City, Kanagawa Prefecture. Together with first-Grade Pioneer Kohane Kanzaki, they meet Yokohama's leader, and a young girl named Ginna. But the situation in Kanagawa is dire - and about to get a whole lot worse. Even with his newfound crystal abilities, Kuroki and his new allies soon find themselves seriously outgunned in a desperate battle for survival.