Spoilers: This article reveals the cause of death and why the four people confess.
I'm the Culprit, Episode 1260 (Japanese episode 1201), is an anime-original mystery with no murderer. Yoshiaki Kamata suffers a heart attack, falls onto a paper knife and leaves blood on a medicine bag. Four people falsely claim responsibility because each believes someone they care about needs protection.
A locked room and too many admissions
Takagi asks Conan, Ran and Kogoro to examine the death at the Kamata home. Yoshiaki has been found in a room locked from the inside. The body, the knife and a blood-marked piece of paper initially suggest a killing accompanied by a dying message.
Yoshiaki’s father is the first to say that he is responsible. He describes friction with his son, giving the police a reason he might have wanted to harm him. Yet he refuses to explain how he supposedly committed the act in a room locked from within.
Yoshiaki’s wife Sachiko then makes the same claim. Problems in their marriage appear to provide another possible motive, but again there is no account of the method. His younger brother Mitsumasa follows, offering his own conflict with Yoshiaki and the same silence about the supposed killing.
The situation becomes still stranger when former girlfriend Keiko Mitamura also accepts responsibility. The investigation now has four apparent admissions and no coherent account linking any one of them to the physical scene. More confessions have produced less clarity.
The missing explanation matters more than the stated motives
Conflict with Yoshiaki makes the accounts sound plausible on the surface. It does not explain what happened inside the room. Conan has to test whether these people are reporting actions they performed or trying to take responsibility for actions they imagine someone else performed.
Their shared inability to describe the method is a reason to investigate that distinction. It is not a substitute for examining the body and objects. The physical evidence ultimately supplies the answer that none of their statements can provide.
The supposed message is a medicine bag
The bloodstained paper appears to carry a dying message, directing attention toward a name or number that might identify a killer. Conan instead asks what the paper was used for. It is the bag for Yoshiaki’s oral medication.
That identification changes the interpretation of his final actions. During a heart attack, Yoshiaki tried to obtain his medicine. He fell onto the paper knife, which penetrated his back, and touched the injury while trying to understand what had happened.
Blood on his hand then transferred to the medicine bag. The marks were not an accusation deliberately written for the investigators. They belonged to his effort to reach the medication amid the accident.
The locked door no longer requires an ingenious escape mechanism. No attacker entered and left the scene: the medical crisis, the fall and the transfer of blood occurred while Yoshiaki was alone. The apparent message and the apparent stabbing had encouraged the wrong starting assumption.
The confessions reveal the survivors’ loyalties
Keiko is revealed to be the biological daughter of Yoshiaki’s father. His wish to protect her explains why he is willing to accept blame himself. The relationship between Sachiko and Mitsumasa also complicates their loyalties, while Keiko has her own reason to shield someone within this web of relationships.
The four have not confessed because they killed Yoshiaki. Each has responded to the possibility that a person they care about might have done so. Their willingness to take the blame creates a chain of misleading statements around an event none of them caused.
The resolution does not identify one truthful murderer among several liars. It explains why every confession is false and why the imagined need for protection arose. Yoshiaki’s death is resolved as an accident, with the family’s secrets exposed along the way.
A title that changes meaning at the end
The episode reverses the usual pressure of a detective story. People normally try to avoid being named as the culprit; here they compete for that position without knowing how the supposed crime occurred. The locked room exposes the gap between emotional conviction and firsthand knowledge.
The medicine bag is an effective clue because it asks for a change of interpretation rather than a more elaborate code. A blood mark can be evidence of movement and contact without being an intentional message. Once its purpose is restored, the rest of the scene can be read differently.
The desire to protect someone gives the confessions an element of care, but the episode also shows how that care can obscure the truth. The survivors’ entangled relationships dominate the aftermath, leaving an uneasy family drama even after the murder mystery disappears.
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