Spoilers follow for the concealed body, the old robbery and the attempted murder.
The Detective Boys and the Traditional Dream House, international episode 1216 (Japanese episode 1158), contains two different culprits. The former resident, a gardener, killed his wife and hid her body in a wall. The new owner, Akihito Haga, is an earlier robber returning for fifty million yen buried in the garden; he later tries to kill his own wife, Akari.
This is a self-contained anime-original case. Its central clue is a wrongly reassembled stone lantern, which connects the apparent renovation project to money that someone else has already dug up. Solving the old murder does not end the danger facing the people now living in the house.
A friendly DIY project uncovers a hidden body
Conan and the Detective Boys meet Akihito and Akari Haga at a home-improvement store, where the couple is buying supplies. The plan to repair an old house in Beika interests the children, and they go along to help. Akihito has bought the property without consulting Akari, a decision that will soon look much more troubling than an impulsive purchase.
Akari notices a stain on a wall. When Akihito breaks into it, human bones emerge. The relaxed visit becomes a police scene, with Takagi and Chiba arriving to investigate. The question changes from how to restore the building to why a body has been concealed inside it.
Neighbors describe the previous residents as a gardener and his wife who left in a hurry. A doghouse and three large dogs remain part of the property’s surroundings. These traces point the investigation toward the earlier household, but the bones and the physical alterations to the house require their own explanation.
The pajamas and the lantern point to different parts of the past
The dead person is wearing pajamas. To Conan, that makes a killing inside the home a plausible explanation, rather than an attack elsewhere followed by an unrelated discovery. The clothes help direct attention toward domestic circumstances, but do not identify the killer by themselves.
Mitsuhiko notices that the light chamber of the garden’s snow-viewing stone lantern has been put back upside down. It is a small error with a larger implication: someone has taken the lantern apart and reassembled it. That intervention leads to the ground around it and something once hidden there.
The two observations should not be collapsed into one clue. The pajamas concern the body and its circumstances. The reversed lantern points toward disturbance in the garden, opening a second history that continues after the identity of the skeleton is established.
The gardener’s wife and the money that divided them
Police identify the remains as the gardener’s wife, who had been treated as missing. Her husband is arrested and confesses to killing her and hiding her in the wall. He is the culprit in the skeleton case, not Akihito.
The gardener had found and dug up fifty million yen buried near the lantern. The money became a source of conflict between him and his wife, and he killed her and concealed her body. In replacing the lantern after recovering the cash, he got the light chamber’s orientation wrong.
His confession resolves the old disappearance, but the cash explains why the present owner’s interest in the property matters. The house holds an overlap of crimes, rather than a single secret whose discovery makes everything safe.
Akihito bought the house to retrieve the proceeds of a robbery
Eight years earlier, Akihito robbed a company of fifty million yen and buried the money in this garden. His purchase is a way to return to the hiding place and recover it. The dream of renovating a traditional house provides a respectable explanation for being there and working on the property.
By the time he returns, the gardener has already removed the money. The misplaced lantern exposes that earlier disturbance and undercuts the apparent purpose of Akihito’s renovation. His attachment to the house is directed toward retrieval, not simply a future home with Akari.
Akihito also intends to kill Akari and hide her in a wall. The renovation gives him a reason to obtain materials and to create noise, broken surfaces and repair work. Those otherwise ordinary signs of DIY could help conceal the preparations and aftermath of another crime.
The present-day attack is stopped before the pattern repeats
As Akari approaches the truth, Akihito attacks her with gardening rope and tries to strangle her. He is caught in the act and arrested for attempted murder. The investigation also exposes his responsibility for the eight-year-old robbery.
The distinction between the two wives is essential to the ending. The gardener’s wife is the murder victim concealed in the old wall; Akari survives the attack that is stopped in the present. The repeated setting and intentions do not make the two crimes interchangeable.
Why the house’s history remains unsettling
The episode turns a cheerful idea—friends helping a couple build a home—into an examination of what ownership can hide. The wall reveals the gardener’s concealment of his wife’s body, while the wrongly reassembled lantern shows that the buried cash was disturbed before Akihito returned to retrieve it. Both are ordinary features of the house that have been altered for concealed purposes.
Afterward, the property is put up for sale again, leaving the Detective Boys to consider how its history should be handled. The case’s uneasy final question grows directly from that return to the market: restoring a building’s appearance does not remove what happened inside it.
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