Shōnen and companions flee their dwelling, journeying back 70,000 years to a void where no one existed, allowing them to forge an exclusive utopia. Once they savor the liberty of that epoch, Shōnen and companions depart their haven and return to the present. Yet a few days later, they encounter a primitive man named Kukul in modern times. They learn that Kukul was inadvertently carried forward, and his Hikari tribe suffered an assault and kidnapping by the Giga Zombie and Kurayami clans after Shōnen left the ancient era.
Shōnen and companions resolve to revisit antiquity to rescue Hikari from the menace. They plunge into a vast expedition during their inaugural and most distant escape. Their journey is fraught with perilous trials, as they must navigate treacherous terrains and outwit cunning adversaries to safeguard the tribe's future. Together, they forge an unbreakable bond today.
