Nakamoto and Takei investigated the potential murder of Sayuri Kambe by Shigemaru, Daisuke’s father. Nakamoto received no help from the Kambe family and instead stole a photo album from which a witness identified Shigemaru as the murderer. Police Director Saiki, Takei’s now deceased father-in-law, kept a close eye on the investigation. Nakamoto found a locker key in the album marked with the symbol for Adollium, a dangerous material Shigemaru had been researching. Takei located the locker while Nakamoto learned Shigemaru committed suicide, followed by the key being stolen from his desk...