Girls Day Mystery 4

Chronology
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Episode 1186 (Int. Episode 1244)
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Information
Title:	Girls Day Mystery 4
Japanese title:	女子会ミステリー4(フォー) (Joshikai Misuterī Fō)
Original airdate:	December 27, 2025
Filler case:	#453
Season:	30
Manga source:	TV Original
Case
Cast:	Conan Edogawa Hiroshi Agasa Ran Mouri Sonoko Suzuki Ayumi Yoshida Ai Haibara Miwako Sato
Case solved by:	Ai Haibara
Next Conan's Hint:	Holy grail
Staff
Director:	Yasuichiro Yamamoto Nobuharu Kamanaka
Screenplay:	Akatsuki Yamatoya
Storyboard:	Mitsuko Kase
Episode director:	Minoru Tozawa
Animation director:	Keiko Sasaki
Character design:	Masatomo Sudo Masanori Hashimoto (sub-character) Hiroshi Ogawa (design works)
Voice Cast: Minami Takayama as Conan Edogawa Kenichi Ogata as Hiroshi Agasa Wakana Yamazaki as Ran Mouri Naoko Matsui as Sonoko Suzuki Yukiko Iwai as Ayumi Yoshida Megumi Hayashibara as Ai Haibara Atsuko Yuya as Miwako Sato Takeo Otsuka as Yukio Kashima Chiaki Kobayashi as Sora Tsujino Daisuke Kasuya as Police officer Sara Matsumoto as Naoko Shimamura Haruka Okamura as Satomi Amari Yasuhiro Fujisawa as Ryuichiro Mita Takayuki Kondo as Shunsuke Yoshimura Ayumi Hinohara as Kyoka Kasai
Music
Opening song:	Poker Face
Closing song:	Fun! Fun! Fun!

Girls Day Mystery 4 (女子会ミステリー4(フォー) ,Joshikai Misuterī Fō) is the 1186th episode of the Detective Conan anime.

Cast

Characters

Conan Edogawa

Hiroshi Agasa

Ran Mouri

Sonoko Suzuki

Ayumi Yoshida

Ai Haibara

Miwako Sato

Case

Situation

Haibara, Ayumi, Ran, Sonoko, and Sato go to an all-you-can-eat sweet shop in Haido Town Royal Hotel, celebrating the good health and future achievements of the girls. However...

Murder/Attempted murder

Location: An all-you-can-eat sweet shop in Haido Town Royal Hotel

Victims: Satomi Amari ;(deceased) and Naoko Shimamura ;(hospitalized)

Age: 21 years old (both victims)

Method: Poisoning using snake venom

Suspects: Kyoka Kasai, Ryuichiro Mita and Shunsuke Yoshimura

The two ladies began to writhe in pain and suddenly collapsed after consuming the drink, with one having passed away.

Ran tries to contact Shinichi Kudo for help solving the case, while Ayumi calls Conan. However, none of their calls are answered, as Conan (and therefore, Shinichi) is busy fishing with Professor Agasa. It seems the girls will have to solve the case on their own.

The police begin to interrogate people who were nearby when the incident occurred, as usual.

• Kyoka Kasai, an employee of the shop who is also a sociological student at Haido Women’s College, along with the two victims, said that the two girls were good and earnest, while still crying over Satomi Amari’s death. She also states that no one hates the two of them.
• Ryuichiro Mita, an Office worker at the Haido Brotherhood Company, remembers that Naoko Shimamura may have interviewed for a position in the company.
• Shunsuke Yoshimura, a municipal worker, is seen acting strangely upon being shown the piece of skin left at the scene by the police, which catches the attention of Ayumi.

The second round of interrogation begins as the girls suspect that Yoshimura is not the only one out of three to know about snakes:

• As Ayumi expresses her suspicion toward Yoshimura, he then has to reveal that he is also a snake hunter, and he was afraid of being convicted for murder if he told them the piece was from a snake. In addition, the cause of the poisoning is revealed to be snake venom. What a coincidence!
• The next one, Kasai, confesses to the girls that she herself also knows snakes, as she is working very hard to become an underground snake charming idol. Kasai also notes that the snake she has for training, Kobu, has had its fangs removed so that Kobu can bite her all day and she’ll be just fine!

After reviewing the information they’ve just gathered, Ayumi proposes using their imagination to figure out who the true culprit might be, which further confirms that anyone could be the culprit. Just then, Ran’s statement helps Haibara realize something, as she then asks the two police officers to confirm a few things.

People

Satomi Amari
	Victim (poisoned) 21 years old Sociology student at Haido Women's University

Naoko Shimamura
	Victim (poisoned) 21 years old Sociology student at Haido Women's University

Kyoka Kasai
	21 years old Sociology student at Haido Women's University Haido Town Royal Hotel part-timer Underground snake charmer idol

Ryuichiro Mita
	44 years old Pharmaceutical researcher at Haido Brotherhood Company

Shunsuke Yoshimura
	32 years old City hall worker Snake hunter

Sora Tsujino
100px	23 years old Tokyo MPD police officer

Yukio Kashima
100px	25 years old Tokyo MPD police officer

Police officer
100px	Tokyo MPD police officer

Resolution

  Show spoilers »

Haibara’s theory: Since the statement of medicines being less effective the more you use them also applies to poison, Haibara suggests that Naoko Shimamura repeatedly ingests snake venom. Hence, she has enough tolerance to survive doses that usually kill a human.

It is also revealed that Satomi Amari once insulted the snake Naoko Shimamura bred half a year ago during an argument. The police also received information that Shimamura had gotten away from the hospital. This further supports the suspicion that Shimamura became upset and waited for an opportunity to seek revenge.

However, it is unclear why the girls and the two officers end up surrounded by snakes. Suddenly, Kyoka Kasai, Ryuichiro Mita, and Shunsuke Yoshimura come to the rescue. Kasai had overheard that Shimamura had disappeared from the hospital and thought she must have come to the current location, so she called the other two for assistance. Just as the case seems to be over, a black, seemingly venomous snake bites Sonoko. But it turns out that the snake is not even venomous, and Sonoko faints, thinking that a venomous one bit her.

Trivia

• The "challenge" to poison the holy grail is a reference to Indiana Jones.
• The fish Conan caught in the episode were the following: An immaculate boxfish, a scrawled filefish (which Conan thought was a thread-sail filefish), a brown-lined puffer (which Agasa thought was blacktail tripodfish), and a marbled flounder. All of which, except the last one, are venomous.
• The sweets mentioned are Mont Blanc with Tamba chestnuts, tarte Tatin with Shine Muscat and Kyoho grapes and Griotte-Pistache tart (made with tart cherries and pistachios).
• Haido University is modeled after Rikkyo University, which was featured in The Ranpo Mansion Murder Case.

Gallery

In other languages

Language	Title	Translation
French (Subbed)	Une enquête entre filles 4 (quatre)	Girls' investigation 4

See also

• Season 30
• Girls Day Mystery (series)