Nagisa Natsunagi

Nagisa Natsunagi is a classmate of Kimizuka Kimihiko who, driven by an inexplicable obsession following her heart transplant surgery, enlists his help to track down a missing person. As the story unfolds, a stunning truth is revealed: the heart now beating within her once belonged to the legendary detective Siesta. Guided by that inherited will, Nagisa steps into the role of detective, combining sharp instincts with bold, decisive action to solve mysterious cases alongside her allies — all while gradually uncovering the dark secret of her past as a former member of the clandestine organization SPES.