Trace ~ Men of the science school ~

Reiji Mano (Ryo Nishikido) and Nonna Sawaguchi (Yuko Araki) attend a murder site, after a body is discovered at an apartment by the owner, after receiving reports from people, that they are unable to get in contact with the individual. From evidence which are left at the site, there is a high possibility that the killer had used a deadly knife.