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The Spiral Mansion Mystery

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Chronology
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Episode 1195-1196
(Int. Episode 1254-1255)

Information
Title: The Spiral Mansion Mystery
Japanese title: 館ミステリー 渦巻館
(Yakata Misuterī Uzumaki-kan)
Original airdate: March 28, 2026 (Part 1)
April 4, 2026 (Part 2)
Broadcast rating: 4.9% (Part 1)
6.0% (Part 2)
Filler case: #458
Season: 31
Manga source: TV Original
Case
Cast: Conan Edogawa
Ran Mouri
Kogoro Mouri
Juzo Megure
Wataru Takagi
Yoko Okino
Case solved by: Kogoro Mouri (via Conan)
Next Conan's Hint: Drill (Part 1)
Rope (Part 2)
Staff
Director: Yasuichiro Yamamoto
Nobuharu Kamanaka
Screenplay: Hiro Masaki
Storyboard: Masaki Ozora
Episode director: 1195: Yuki Kawakata
1196:
Yoshihiro Sugai
Tsukasa Saito (asst.)
Animation director: 1195:
Kaoru Nagakawa
Michitaka Yamamoto
Yukari Kamiaka
Zi Dengjia
Marie Nagano
Kana Aoki
Asuka Tsubuki
1196:
Kosei Takahashi
Eiichi Tokura
Character design: Masatomo Sudo
Masanori Hashimoto (sub-character)
Hiroshi Ogawa (design works)
Production cooperation: 1195: Azeta Pictures
1196: Mouse
Voice Cast:

Minami Takayama as Conan Edogawa
Akemi Okamura as Ran Mouri
Rikiya Koyama as Kogoro Mouri
Chafurin as Juzo Megure
Wataru Takagi as Wataru Takagi
Yoshimitsu Shimoyama as Sensuke Tsurufuji
Taro Kiuchi as Satoshi Omagari
Akeno Watanabe as Yoko Tsurufuji
Mie Sonozaki as Maimai Tsurufuji
Azusa Tadokoro as Kaoru Neji
Junya Enoki as Kazumi Hayase

Music
Opening song: Heaven Knows
Closing song: TOWA ~Towa ni Kaze ni Noru~

The Spiral Mansion Mystery (館ミステリー 渦巻館 Yakata Misuterī Uzumaki-kan?) is the 1195th and 1196th episode of the Detective Conan anime.

Cast

Gadgets

Case

Situation

Part 1

A few days ago, Kogoro got hyped up when he saw Yoko Okino at the Spiral Mansion on TV, so he is taking Conan and Ran to the location today.

The Tower of Babel
The Abyss

The family are still debating about the tower of Babel when the curator Kaoru Neji arrives and explains to them about various spiral art and the owner of them, Kyu Tsurufuji. Later, the art magazine editor Kazumi Hayase arrives as he has an appointment with Neji and several members of Tsurufuji family: Kyu’s son Sensuke Tsurufuji, Sensuke’s younger sister Maimai Tsurufuji, and Sensuke’s wife Yoko Tsurufuji. While the Mouris continue their visit, the people in the appointment seem to have split opinions when Hayase tells them that the publication fee is 300.000 yen.

Even though Maimai accepts the deal, both Sensuke and his wife refuse it because they don’t have the money to. As Sensuke leaves the room, followed by Maimai to convince him to reconsider, Yoko also leaves on her own while Hayase apologizes for what happened, to which Neji tells him that it’s not his fault, and thanked him for coming.

Meanwhile, Kogoro and his family have just finished a room, and decide to go to another one. On their way outside of the room, they realize that there is no more room to visit that way, so they will have to go on another route, but their visit is cut off by a scream, followed by a gunshot. Kogoro tells Ran and Conan not to follow him, only for him to realize they did the complete opposite when he discovered the body of Sensuke. Still, he asks his daughter to call the police.

Murder
Location: Bathroom in the Spiral Mansion 3rd floor
Victim: Sensuke Tsurufuji
Age: 41 years old
Cause of death: Gunshot wound to chest
Suspects: Kaoru Neji, Kazumi Hayase, Maimai Tsurufuji, Yoko Tsurufuji

Later, we can see that Conan is checking the mansion guidebook for navigation. Then, he tries to count how many footsteps he needs to walk from one floor to another. He notices that the distance between the 3rd floor and the 4rd floor is 50% longer than the others, from which he deduces that there must be a half-floor space in between the two floors.


The board at the top of the spiral stairs

Conan asks Sensuke’s wife for permission to check the building’s blueprint, to which she suggests he ask Neji instead. However, he finds nothing from the blueprint, so he observes somewhere else. Only after Conan reads the dialogue at the top of the spiral stairs again and sees both the Abyss and the tower of Babel does he realize that he should use the latter to put in the former.

Conan asks Neji if they can put the Abyss like that, Neji hesitates but Maimai sympathizes with his curiosity, mentioning that she did want to do so when she was young. As she put the tower of Babel down to the Abyss, it makes a sound of an ancient mechanism as the floor Conan, Ran, Neji and Maimai are standing is gradually lowering.

The secret of the Spiral Mansion


As the sound of the ancient mechanism ends, Kogoro arrives with Takagi and Megure, asking what the sound was. Conan leads everyone to the secret room of the building. However, Megure perceives this discovery to be not useful, while Kogoro wonders the whereabouts of Satoshi. Feeling that something is off with how long he has been gone and how Maimai explains about her husband's walking habit, Megure orders Takagi to find Satoshi.

Murder
Location: A stream near the Spiral Mansion
Victim: Satoshi Omagari
Age: 39 years old
Time: 1:15 PM
Cause of death: Cerebral contusion from a blow to the back of the head
Suspects: Kaoru Neji, Kazumi Hayase, Maimai Tsurufuji, and Yoko Tsurufuji

Part 2

In the river near the mansion, the body of Satoshi is discovered along with a strange spiral nearby. Strangely enough, Conan points out that there is a spiral inside the rifle instead of the spiral that the toilet has when flushing. The police begin to verify the alibis of the remaining suspects at 1:15 PM, the estimated death time. Neji was talking with Hayase at the time, Maimai was in the studio on the fourth floor, and Yoko Tsurufuji was in the room until Conan arrived and asked for the blueprint. Maimai says that Yoko could’ve gone to the bathroom at some point, hinting that she is the murder.

Conan has another walk to the location where Satoshi was drawing previously and then he walks around the mansion. He overhears the conversation between Maimai and Yoko Tsurufuji about splitting properties after the case is over. It turns out that Sensuke decided that the art made by his father would belong to the museum, so that means “zero divided by any non-zero natural number equals zero”. Yoko goes out and sees Conan, she asks him if he was eavesdropping before eventually leaving. Maimai then asks Conan why he came here, he asks her if he could see the drawing Satoshi brought back with him.

Satoshi's drawing is actually used to hide Kyu's art that he was going to sold

The two then observe the drawing. Maimai is surprised to see Satoshi’s different approach to drawing the building, while Conan points out that the drawing is double-layered, which got her thinking about what is in the inner layer. As she opens the first layer of the drawing, she discovers that her husband used his painting as a way to conceal the drawing that he intends to sell: her father's art. She is upset with this discovery, and tells Conan not to reveal this to anyone. He agrees.

Conan goes outside and sees the windows being tidy on both sides, which makes him curious how it is possible, so he asks Neji about it. She explains that they have the cleaner drop down from the rooftop, then she asks him if she can make his discovery about the building public.

Attempt murder
Location: Outside Spiral Mansion
Victim: Kaoru Neji
Age: 25 years old
Time: At dusk
Cause of death: Dropping a brick onto her head
Suspects: Kazumi Hayase, Maimai Tsurufuji, and Yoko Tsurufuji
As Conan is thinking about Neji's offer, he sees a brick that is going to fall on to her, so he pushes her out. He looks up and sees someone standing at the rooftop.

He hesitates, but before he can think further, a brick is falling onto her, forcing Conan to push her out. He then sees someone on the rooftop of the building, so he goes to the location to find him, but only finds a rope that was probably used by the culprit to escape.

People

  • Resolution

    Trivia

    • The suspects have names related to "spirals/turning":
      • Sensuke Tsurufuji (弦藤 旋介)'s first name contains the kanji "旋" in "rotation" (旋回 senkai?) ;
      • Maimai Tsurufuji (弦藤 舞々)'s first name contains the kanji "舞" in "to rotate"/"to spin" (舞う mau?) ;
      • Kaoru Neji (根次 薫)'s last name is similar to "screw"/coil" (螺子 neji?) ;
      • Satoshi Omagari (大曲 悟志)'s last name contains the kanji for "twist"/"turn" ( magari?).


    In other languages

    Language Title Translation
    Flag of France French (Subbed) Mystère au manoir : Le Musée du tourbillon Mystery at the mansion: The spiral museum
    Flag of Germany German (Subbed) Mysterium im Museum: Die Spiralen-Villa Mystery at the Museum: The Spiral Villa
    Flag of South Korea Korean 소용돌이 저택 미스터리 The Spiral Mansion Mystery

    References

    See also

    Episodes of Season 31
    Episode 11871188118911901191119211931194119511961197119811991200120112021203