Four years ago, a hijacked airplane turned Kimihiko Kimizuka into the reluctant assistant of the detective Siesta, and the two spent years afterward crossing the globe to fight a shadow organization together. With Siesta gone, Kimihiko tries to settle into an ordinary high school routine, but Nagisa Natsunagi and Charlotte Arisaka Anderson keep pulling him back toward the world he thought he'd left behind. This manga adapts the light novel's main storyline.