In the midst of their idyllic high school life, the spirited student Kaname Chidori and soldier Sousuke Sagara face a sudden upheaval when the terrorist group Amalgam disrupts their peace. Seeking Kaname for her unique 'Whispered' abilities, the organization's member Leonard Testarossa plunges the duo into a global conflict. Their journey from familiar surroundings to far-flung destinations like Laos and Mexico becomes a relentless pursuit to dismantle Amalgam. As Sousuke delves into gathering crucial intel, Kaname grapples with her evolving powers and mounting frustrations. Amidst a high-stakes game of wit and strategy, the pair strives to strengthen their bond and surpass their individual limitations.