Sakuya and Lilithea are invited by Haigamine Yuriu to a private screening of her first starring film.The screening takes place at the Crimson Theater, a bright red theater with both its exterior and interior decorated in crimson.During the screening, Sakuya is poisoned to death.Why was he targeted? After coming back to life, Sakuya searches for clues to the killer in the film that is currently being shown.Meanwhile, Shardina, one of the internationally wanted criminals known as the "Seven Old Men," seems to be taking an interest in Sakuya...

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...

The dog-headed bellboy murdered Yuri's manager, Meikuji, and then killed Sakuya.When Sakuya came back to life, he saw a dragon sculpture in the hotel lobby with Meikuji's head in its mouth.Four precepts were written behind the reception counter. Two of them were painted over, suggesting the killer was planning a murder based on them.According to the hotel owner, the dog-headed bellboy had appeared twenty years ago as well...