Arise takes place in a setting divided between the medieval world of Dahna and the advanced world of Rena. Three centuries ago, the Renans based on Rena's artificial moon Lenegis invaded and conquered Dahna, enslaving the population and dividing the land into five isolated realms. Periodically, the "Crown Contest" is held to decide which among the five Lords is chosen to become the next Renan Sovereign.
At the realm of Calaglia, a masked Dahnan slave with no memories of his past, nicknamed "Iron Mask", gets himself involved with the Crimson Crows when they rescue a Renan girl called Shionne Vymer Imeris Daymore, whom he finds familiar, from imprisonment. Shionne is afflicted with a curse that hurts anyone who touches her. While evading their pursuers, the slave pulls a blazing sword from the Master Core in Shionne's possession and uses it to repel the Renan forces. As only Iron Mask can wield the sword due to his inability to sense pain, he and Shionne form an alliance to take down the five Lords and gather the other Master Cores they possess.
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