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Kaito, an ordinary high school student, was overcome with depression as he lost touch with his childhood friend and first love, Marie. Overwhelmed by loneliness, he attempted to end his life at a train station after witnessing a heartbreaking scene. However, a mysterious force intervened, transporting him to a futuristic, neon-lit metropolis. There, he encountered a peculiar scavenger girl named Starfire. Together, the two embarked on a quest to explore ancient, pyramid-like ruins scattered across the endless city, known as Techno Tombs. Their mission: to uncover clues that would help the boy fulfill his destiny as a hero and potentially return to his world.