Yugami mysteriously vanishes after visiting a hospital where Hizumi is in a coma. Meanwhile, Hanyu and the team discover that the supposed dead author, who was responsible for the murders years ago, may still be alive and behind recent crimes.
A wealthy former doctor is found brutally murdered in his home, with a cryptic note suggesting revenge as the motive. Despite the eerie similarities to a crime depicted in an unfinished novel by a notorious criminal, Yugami remains oddly uninterested, even as the team pursues the case, suspecting the doctor’s long-lost son might be involved.
Yugami, feeling down about his favorite racehorse's retirement, takes Hanyu to a nightclub where they encounter a former thief, now trying to live an honest life. A few days later, she is found dead with a large sum of money, and her death is deemed an accident. However, Yugami suspects foul play due to her past skills and a promise she made to him. Meanwhile, the team is drawn into a fraud investigation targeting the elderly, where an unexpected connection to the woman’s death emerges.
The detectives investigate the poisoning death of Sugano's friend, Eriko, who was found dead shortly after a reunion. Despite her seemingly happy life, it’s revealed that she was struggling with a demotion and had secretly left her job months earlier. As they dig deeper, they uncover a hidden relationship and a dark secret that complicates the case.
A wealthy young IT entrepreneur is attacked at a planetarium after posting about his visit online. The victim, known for aggressive business tactics, has many enemies, including a telescope maker whose company he drove to bankruptcy. As the detectives investigate, they uncover a web of resentment and business rivalries, leading them to suspect a connection with a popular game app and its creator.
A kidnapping case involving the daughter of a prominent family is marked by a symbol linked to a past murder inspired by a sinister novel. The author of that novel, who used the same symbol, was once apprehended by Yugami. As the investigation deepens, old connections resurface, leading to a tense ransom demand that forces the detectives to unravel the mystery.
Yugami and Hanyu investigate the suspicious death of an architect who fell from an unfinished building. The investigation reveals a love triangle involving the victim, his fiancée, and a colleague who claims self-defense during a confrontation. The case takes a personal turn when it’s discovered that Hanyu had previously dismissed the victim’s earlier stalking complaint.
Yugami and Hanyu investigate the brutal attack on Sergeant Masashita, a beloved officer found unconscious in the mountains just before his retirement. As they uncover clues involving a mysterious sketchbook and a suspicious man seen at the hospital, Hanyu vows to catch the culprit responsible for harming his respected mentor.
Yugami and Hanyu investigate an attempted rape case involving a middle school teacher, Chisato, who was attacked in her apartment. Although Chisato refuses to cooperate, the detectives discover a connection between her and a student, leading to the identification of a suspect through clues left at the scene.
Detective Yugami, a quirky and unconventional investigator, partners with the ambitious rookie Hanyu to solve the suspicious death of a female college student, uncovering a web of secrets involving harassment and a mysterious suspect.
