A man is found dead exploded in a lake. Meanwhile, in a school, an art student produced a piece he called 'The Death Mask' which accurately resembles a missing person. A disturbing past was also discovered between Yukawa and the prime suspects of the murders.

Yukawa confrots his ex-teacher regarding the double-murders which then ended up in the death of the secretary of his teacher. After, Utsumi is faced with a life-threatening situation that only Yukawa can handle.