The Detective Is Already Dead

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

After Nagisa Natsunagi asks him to search for an unknown person named X, Kimizuka seeks help from Fuubi.

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 their best to protect Yui Saikawa who is performing a stadium show. However, the two start to suspect that the idol has been hiding some 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.

A detective's assistant stumbles on a case interlinking murder, global conspiracy and the death of his partner.