Ceres was a tennyo (Celestial maiden) who came down from the heavens to bathe in a stream. She hung her hagoromo (robe) on a tree nearby, which was her key to returning to the heavens. But the robe was stolen and the man who had stolen it forced her to become his wife, thus producing a family full of human and tennyo blood mixed. Now, in modern day time, Aya Mikage is a descendent of Ceres, and has quite an amount of tennyo blood. On her 16th birthday, she and her twin brother, Aki, are thrown a party. At the party, Aya's grandpa plans to kill her, for she has tennyo powers unlike the rest of the family, and can actually become Ceres herself and destroy the Mikage family. Aya, however, can switch back, so this transformation happens quite frequently. With protector Yuuhi by her side, it is up to Aya to control Ceres and keep her from coming back, but her relationship with an ex-worker for her evil grandpa may be a distraction.

The Band of the Hawk and their enigmatic leader Griffith continue winning battle after battle as their prestige throughout the kingdom of Midland grows. But their latest task is one that has seen failure from everyone who has attempted it: the subjugation of the impenetrable fortress of Doldrey. But with members like Guts—the captain of the Hawks' raiders who can easily fell 100 men with his gigantic sword—such tasks prove to be trivial. However, in the aftermath of the battle, Guts decides to leave the Hawks in order to pursue his own dream and bids farewell to his companions, despite Griffith's attempts to make him stay. This single event causes Griffith to lose his composure, and leads him to make a decision that will alter his and the Hawks' fates forever.

Keita Aono is an ordinary high school student who loves to chat with his friends about military technology and the girls in their class. One day, Keita is surprised and delighted by a new transfer student in his class, his childhood friend Hinoki Sai. But when Keita tries to catch up with Hinoki after school, he accidentally wanders into Bottom World—an underground amusement park whose opening was canceled due to an unexplained tragedy. As Keita explores the area, he eventually finds Hinoki in the cockpit of a strange robot. She is here on behalf of Akamatsu Industries, a company contracted with the secretive international organization Mode Warp to investigate strange cases of violence worldwide. After joining Hinoki in the robot, the pair attempt to defend themselves against the various attractions of Bottom World, which have come to life and become violent. However, they are unable to escape until a man with transforming powers—dubbed Betterman—joins their struggle. Faced with an enemy he does not understand and a slew of mysterious new technology, Keita joins Akamatsu Industries in a fight against a force they call Algernon.

Fleeing a traumatic childhood, lone mercenary Guts drifts from battle to battle, striking down powerful enemies with his unwieldy sword. After one skirmish, Guts clashes with the mystifying Griffith and his small army known as the Band of the Hawk. The victorious Griffith drafts Guts into his ranks, granting the swordsman a kinship unlike anything he has ever known. Alongside the skilled warrior Casca, Guts helps Griffith guide the band to fame and glory. But as he gains military prestige, Griffith becomes the target of assassination attempts and political schemes. He uses Guts to further his ambitious rise to power, taking advantage of the swordsman's lack of aspiration. Even as he grows closer to Casca, Guts' absence of direction robs him of any sense of belonging. Fostering opposing desires, Guts and Casca fight for Griffith's dream—although fractures forming among the trio threaten to disrupt their world.