A water leak at the detective agency forces Sakuya and Lilithia to take refuge at the Kowloon's Hotel.
There, they find Yuri and the film crew shooting their next project, as well as, for some reason, the familiar detective Manroki.
Manroki explains that the director received a threatening letter from someone called "the dog-headed bellboy."
Sakuya and the others decide to patrol the hotel to make sure the film crew is not harmed.
Along the way, Sakuya encounters a suspicious man wearing a dog mask...

While concerned about the movements of the "Seven Old Men," Sakuya and Lilithea accept a request to find a ring.
They head to Mizushima Park, the amusement park where the ring is believed to have been lost, and as they search the park, they receive a call from Fido, Britain's top detective.
They try to meet up, but Sakuya is involved in a car accident and they miss each other.
After being taken to the hospital, Sakuya contacts Lilithea and tries to return to Mizushima Park. On the way, a major incident occurs on the Ferris wheel…