Spoilers: the following discussion reveals the killer, the staged attack and the final reversal.
Best Husband, international episode 1191 (Japanese episode 1133), is an anime-original mystery. Taro Mutsu kills Akamatsu and tries to make his wife Reiko appear responsible while presenting himself as the husband willing to protect her. Kogoro’s first solution is part of the performance Taro wants the witnesses to believe; Conan has to uncover the earlier false-blood staging to expose the real murder.
An attacker leads the witnesses into a locked basement
Politician Reiko Mutsu invites Kogoro to her mansion for a confidential consultation. Ran and Conan accompany him, and her secretary Inui shows them inside. The family portraits and the strained behavior around the house give the visit a formal, uncomfortable atmosphere even before Reiko appears.
Her scream interrupts the wait. A man whose hat, mask and sunglasses conceal his face pursues her with a knife. When Kogoro and Conan give chase, he heads into the annex basement and locks the door. He could have continued toward the gate, so his choice of refuge is already suspicious.
Inui unlocks the basement. Inside are Akamatsu’s stabbed body and a blood-covered Taro, sitting with a paper knife in his left hand. A fire is burning in the fireplace despite the summer heat. At first, the scene offers a simple story: a fleeing intruder encountered Reiko’s husband and died during a struggle.
Kogoro follows clues that seem to reveal a protective husband
Megure and Takagi investigate. The dead man is identified as Akamatsu, but the masked attacker’s behavior and the basement’s heat do not fit comfortably with a spontaneous act of self-defense. Taro’s apparent willingness to take responsibility helps direct attention toward what he might be concealing for someone else.
Kogoro notices the fireplace, Taro’s sweating and details of handedness, including the wristwatch. The pursuing figure held the knife in his left hand, whereas Akamatsu was right-handed. Kogoro concludes that the attacker the group chased was Taro in disguise. The fire can account for disposing of disguise materials and interfering with the apparent time of death.
Photographs found in a wastebasket bear Akamatsu’s fingerprints and suggest a compromising relationship between Reiko and Inui. They establish a blackmail story in which Reiko has a reason to strike Akamatsu. Reiko and Inui’s attempts to protect one another make that explanation look more convincing.
Reiko admits to stabbing him, and Kogoro’s reconstruction casts Taro as the husband who disguised himself and staged the later intrusion to cover for her. His apparent relief that he, rather than Reiko, was in danger sounds like devotion. The solution is persuasive because the clues and his testimony have been arranged to produce exactly that impression.
The apparent killing happened before the real one
Taro’s plan begins with Akamatsu’s cooperation. Akamatsu is to perform an attack and pretend to have been killed in the response. Fake blood makes the first incident look real, leaving Reiko with reason to believe she has stabbed a man. The blackmail photographs supply the surrounding explanation for why she would have done it.
After Reiko and Inui leave the basement, Taro has Akamatsu change clothes and then actually kills him. Akamatsu’s agreement to participate in a false death does not extend to this second stage. Taro can now use a real body to substantiate the false story Reiko already believes.
The masked pursuit seen by the arriving witnesses is Taro’s performance. The conspicuous fireplace, the mismatch in handedness and the photographs are not merely careless errors that he hopes the detective will miss. They are features he wants Kogoro to notice, so the investigation will move beyond the initial self-defense account to the more useful story of a wife protected by her husband.
That is why identifying the disguised pursuer is not the end of the case. Kogoro correctly detects a cover-up, but the cover-up itself is designed to conceal another deception. The central question becomes whether Akamatsu really died in the incident Reiko describes.
Reiko’s nails expose the false-blood staging
Conan notices the traces around Reiko’s heavily painted nails. They reveal the false-blood staging and break the assumption that her apparent stabbing was the fatal attack. Akamatsu was still alive after the incident that made her believe she was guilty.
This creates a crucial interval between the supposed death and the actual one. Taro was the person left with Akamatsu after Reiko and Inui departed. Once that earlier deception is recognized, his role is no longer limited to disguising himself to protect his wife: he had the opportunity to turn the staged death into a real murder.
After the first apparent resolution, Taro is left at the mansion, where his private satisfaction gives way to another explanation delivered through Sleeping Kogoro. Takagi records Taro’s confession with a voice recorder. The supposed self-sacrificing husband is exposed and arrested.
Why Taro wanted to become the “best husband”
Taro resents his place in the Mutsu family. He believes he should occupy its leading position, but instead feels treated as an appendage to Reiko. Framing her for murder would remove her from that position while allowing him to appear loyal and admirable in the process.
His resentment makes the title particularly bitter. Protecting Reiko is the image he sells to the detective, while bringing her down is the purpose of the plan. Akamatsu is both an accomplice to the initial performance and the victim needed to give the accusation substance.
The two resolutions also make unusual use of Kogoro. His waking deduction first feels reassuring: he notices physical inconsistencies and puts them into a convincing sequence. The later reversal shows how a murderer can exploit that expectation by choosing which inconsistencies to offer him.
The closing car scene, with Kogoro finally asleep and Ran reassured by the familiar sight, restores a little of the series’ ordinary warmth. It follows a case in which the language of devotion has been used to hide a calculated attempt to destroy a spouse.
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