Shishigami Takashi has, for a long time, met with murder cases wherever he goes, that's how he got the nickname; the "Shinigami" detective. 、 Shishigami, his wife Michiru, and his kouhai Seki, take a trip to an onsen. However, as soon as they arrive, a corpse is discovered...?! Aside from the titular story, two more mysteries are collected into 1 volume!!

There is a rumour going around about a CD called “Trigger” that can supposedly increase the intelligence of its listener. However, the CD has also been connected to several deaths and disappearances. Chitose’s best friend Hayato listens to the CD, and not long after, Hayato and his whole family suddenly disappear. Refusing to believe that Hayato is gone forever, Chitose becomes determined to find his best friend and the truth behind the CDs. From: The Zero Alliance

“My name is Midou Maria. But not long ago, my name was Ichinose Rei. This Ichinose Rei was a special existence. The worker force for Ichinose Group’s enterprise comprise of nearly half of the corporate town, Segawa. So Rei was that Ichinose family’s heir." But that brilliant future was abruptly snatched away. Given a new name, gender and three hundred million, Rei was banished from Ichinose. With death as her resolution, Maria roamed around the streets, only to land her in a ruin. In there, there is a community… It’s the secret base for juveniles! Together with Yuuki Azusa and Tobe Yuuna, this is the start of a story on mutiny!