The Detective Is Already Dead

When Kimizuka witnesses a plane hijacking, he becomes the sidekick of the detective who stops it.

Nagisa Natsunagi, inspired by her transplant heart, meets Kimizuka; Kimizuka gets information from an unexpected source.

Kimizuka and Natsunagi take on detective responsibilities; Yui Saikawa asks them to protect a sapphire, but there is something bigger at stake.

Kimizuka and Natsunagi try to protect Yui Saikawa but uncover some of her dark secrets.

Siesta and Kimizuka investigate a series of murders by someone called Cerberus, who for some sinister reason steals victims' hearts; as Cerberus eludes Siesta's pursuit, she comes up with a more desperate tactic, much to Kimizuka's dismay.

Siesta pays the price to stop Hel and the terror-beast; Kimizuka discovers something in an alley.