Kaname Chidori, a rowdy student, and soldier Sousuke Sagara are having a great time at high school. Their tranquil days are shattered, however, by the frightening terrorist organization Amalgam. Leonard Testarossa, an organization member who owns "Whispered," pursues Kaname and her expertise. Kaname and Sousuke's fight against Amalgam begins in their local neighborhood and eventually leads them on a global pursuit. Sousuke must gather data from the exotic jungles of Laos to the arid Mexican coast in order to bring down Amalgam. Meanwhile, Kaname's powers improve, but her discontent grows as her determination weakens. Caught up in a heated game of hide and seek as well as strategic schemes, the couple tries to connect and push themselves beyond their own limitations.