Reiko attends a dinner party, but things take a dark turn when a murder occurs. Trapped with her friends, they must uncover the killer among them. Secrets are revealed, and tension rises as they race to solve the mystery.
Mystery butler Kageyama concocts a peculiar plan to catch the criminal lurking in a luxury hotel, after which Reiko and her friends realize the hidden complexity of their own emotions.
While investigating the murder of a real estate tycoon, Reiko examines an erased dying message, a bloody trophy, and a cord yanked from the curtains. Without proof, however, she reaches a dead end.
With Kageyama as her chauffeur, Reiko and her friends visit a crowded summer festival, where a cracked smartphone is discovered. Its owner was poisoned in his apartment, and he died wearing nothing but briefs.
Women of differing heights are spotted at the crime scene. After learning that the victim had scammed several women via dating apps, Reiko inches closer to the truth.
After a delivery man falls to his death, Reiko and Kyoichiro investigate his connection to popular VTuber "Kuru Kuru-Chan," who is blamed for the murder by fans online.
A famous painter is stabbed in his own studio, pointing to his masterpiece wall painting "Sleeping Beauty" just before dying. Suspects include his art-jacking son, his second wife, and an art magazine writer.
Kageyama locates a secret passageway to solve the locked-room murder mystery. Upon encountering a deranged woman wielding a knife, Reiko is left with nowhere to escape. On the next case, a white-suited journalist's body is discovered.
A woman's body is found in a bed of blooming roses at the prestigious Fujikura residence. The victim is Toshio Fujikura's fiancée, and the suspects include members of the family.
Reiko attends the wedding of Sawamura Yuri, who she cherishes like a younger sister. When Yuri is attacked and gravely injured in her room during the party, Reiko risks her identity being revealed to help solve the case.
Trouble strikes the Sawamura family again when Miyuki Sawamura is kidnapped and a ransom of 50 million yen is demanded. With no other suspects, Reiko sets her sights on Hosoyama.
