Souls of Ultima is the story of a once blissful and ignorant girl, Hira Hideaki, an orphan living in a once peaceful city in another world's Japan called 'Mizukawa' as she discovers the hidden realities that were thought to be nothing but fiction. In a world filled with fantastical beings called 'Anomalies' and powers in the form of 'Magica', Hira, alongside her friends and comrades, experiences the effects of these powers in the wrong hands.