Kogoro, Ran, Conan, Heiji, and Kazuha are at a festival when Denkyuu, a student monk, asks them to solve a case of a disappearing body at the temple. Shakuren, the head monk, denies the body's existence and claims Denkyuu is mistaken.
After investigating, Conan and Heiji reveal that Shakuren arranged the temple's blood-stained tatami mats so that the stains are hidden by tatami-squares in the bottom of the glass statue-cases positioned at the four corners of the room. Shakuren reveals that the body was Denkyuu's mother, who abandoned him eighteen years ago. He reveals that she committed suicide after Shakuren refused to give her back her son, when she could not even recognize which one of the monks at the temple he was.
Case 2
Situation
The next day, Heiji takes Conan with him to participate in a reality television deduction competition between high school detectives Heiji Hattori, Natsuki Koshimizu, Junya Tokitsu, and Saguru Hakuba. While there, Tokitsu is murdered and the detectives realize the television programming was a hoax.
After a thorough investigation, the culprit is revealed to be the detective of the South, Natsuki Koshimizu. Koshimizu confesses she was searching for the detective whose inadequate investigation led the police to suspect her friend as a murderer, prompting her friend's suicide. That detective turned out to be Tokitsu, whom she murdered in revenge.