In their quest for the ultimate weapon, the secret organization Talon has delved into the realms of cybernetics and mind powers – culminating in the creation of the superpowered Blue Sonnet. When Talon begins to suspect that high school student Komatsuzaki Lan has level one Esper abilities, Sonnet is sent to observe and test her; but Lan has minimal control over her abilities, and when one of her friends is hurt during Sonnet’s “test,” she flees – with Talon’s forces hot on her trail. While Lan struggles to gain control of her newfound abilities and her humanity, Sonnet finds her own humanity slowly asserting itself. Will Talon succeed in molding Lan and Sonnet into the weapons they desire?