Yako sees Sai, and follows him until he disappears into a house where a man is found dead from a neurotoxin on a desk. Neuro and Yako talk with the desk's carpenter, who tells them about similar cases. The carpenter is arrested after his former apprentice reveals that the desk has a hidden device, and the carpenter thinks that his best works are like beautiful women. Neuro reveals that the apprentice poisoned the victims, telling them that the antidote is in the desk to pretend that the desk killed them.