The previously tranquil high school life of energetic student, Kaname Chidori, and soldier, Sousuke Sagara, is disrupted by the terrorist group, Amalgam. Their archenemy, Leonard Testarossa, who possesses "Whispered" abilities, poses a threat to Kaname's pursuit of knowledge, fueling a localized rivalry against Amalgam. From the exotic terrain of Laos to the arid coast of Mexico, they embark on a global chase. To dismantle Amalgam, Sousuke must gather intelligence while Kaname sharpens her skills. However, her determination falters, resulting in mounting frustration. As they engage in strategic planning and play a high-stakes game of hide-and-seek, they push beyond their limits to strengthen their bond.