Kimihiko Kimizuka spent his teens as assistant to the great detective Siesta, and a year after losing her he is trying to hold down an ordinary high school life with Nagisa Natsunagi and Charlotte Arisaka Anderson. When the three of them are abducted mid-flight, the truth Kimizuka had forgotten about how Siesta died comes back to him. This manga adapts the second volume of the original light novel, the arc that goes back to the days when the detective was still alive.