Muhyo & Roji's Bureau of Supernatural Investigation

Magical law exists to bestow punishment for crimes committed by spirits. Muhyo Toru, an executor of magical law, and his assistant, Kusano Jiro, work at the Muhyo Bureau of Supernatural Investigation. One day, a girl named Rie comes to them for a consultation about a spirit inhabiting the local train station, which she suspects is the spirits of her late friend Taeko.

Kenji visits a spooky shrine on the outskirts of town to prove to his friends that there's no such thing as ghosts... and he rips off a talisman that had been stuck on the shrine door. Later, Kenji brings his sister figure Nana to the Bureau, and Muhyo tells Nana that all the pictures she's shown him are ghost photos. Nana is enraged by his claim, but then...

Muhyo and Roji visit the home of Shiratori Aya, a client who says a black shadow has been playing her piano at 2:00 AM every night. Muhyo concludes that the shadow is a vengeful spirit born from countless people who envy Aya's talent, but in fact... Later, a package arrives at the bureau for Roji, containing a "magic-sealing pen" and an invitation to take an exam for a promotion to first-class secretary. Then Nana enters with a photo she took of a spirit on a pedestrian bridge...

Muhyo and Roji arrive at the Magical Law Association so Roji can take the promotion exam, and for whatever reason, Nana has come along with them. They're greeted by Muhyo's former classmate, Yoichi, who mentions a name that seems to strike fear into the hearts of those who hear it. The gang's concerns become reality when a spirit appears during the exam briefing...

Muhyo has taken care of the spirit that infects people through touch, but Roji feels he's to blame for the chaos it caused and takes off alone. Yoichi follows him and tells him a story from when he and Muhyo were attending the Magic Law School together - a sad story about the two of them and their friend Enchu, a kind, earnest boy who was working harder than anyone to become an executor.

Muhyo, Roji, and Nana visit a rustic hot spring resort to meet a client. They bathe in the hot springs while waiting for him... and then Roji catches a middle-aged man peeping into the women's bath at Nana. The man turns out to be their client and the author of a current best-selling novel series, "The Butterfly of the Night," Yontani Abeyuki.