Girls Day Mystery 4: Difference between revisions

Naoko Shimamura
	21 years old; Victim (poisoned-injured); Sociology student at the Haido Women’s College;

Satomi Amari
	21 years old; Victim (poisoned); Sociology student at the Haido Women’s College;

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Revision as of 09:04, 28 December 2025

Chronology

‹ The Red-Brick Warehouse and the Vanishing Kidnapper

List of Episodes

List of Filler Cases

Episode "ZERO" The Shinichi Kudo Aquarium Case ›

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

Case

Situation

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

Food poisoning - attempted murder

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

Victim: Satomi Amari (deceased), Naoko Shimamura (injured)

Age: 21 years old

Poison: Snake venom

Suspects: Naoko Shimamura, Kyoka Kasai, Ryuichiro Mita, and Shunsuke Yumemura

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 to ask for help solving the case, while Ayumi calls Conan, but the two… he couldn’t answer because he is busy fishing with Professor Agasa. It seems like the girls will have to solve the case by themselves.

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, saying that the two girls were good and earnest, while still crying for Satomi Amari’s death. She also states that nobody hates the two at all.
Ryuichiro Mita, an Office worker at the Haido Brotherhood Company, remembers that Naoko Shimamura may have interviewed for a position in the company.
Shunsuke Yumemura, 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 Yumemura is not the only one out of three to know about snakes:

As Ayumi expresses her suspicion toward Yumemura, 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, while the cause of poisoning is then revealed to be the snake venom. What a coincidence!
The next one… well… Kasai confesses to the girls that she herself also has knowledge about snakes, as she is working very hard to become an underground snake charming idol. Kasai also notes that the snake she has for the training, Kobu, has its fangs removed, which means 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 see who could be the true culprit, which just further confirms that anyone can 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

Kyoka Kasai
	21 years old Sociology student at the Haido Women’s College Underground snake charmer idol

Ryuichiro Mita
	44 years old Office worker at the Haido Brotherhood Company

Shunsuke Yumemura
File:Shunsuke Yumemura.jpg	32 years old Municipal officer Snake hunter

Resolution

Show spoilers »

Trivia

The "challenge" to poison the holy grail is a reference to Indiana Jones.

Gallery

For the full gallery, click here:

In other languages

Language	Title	Translation

References

v • d • e Season 30 (2025)
#1148: The Detective Boys and the Two Leaders (Part 1) #1149: The Detective Boys and the Two Leaders (Part 2) #1150: Kaitou Kid and the Crown Trick (Part 1) #1151: Kaitou Kid and the Crown Trick (Part 2) #1152: Last Dance #1153: The Yamahime of Yakushima (Part 1) #1154: The Yamahime of Yakushima (Part 2) #1155: Follow Them! Detective Taxi 2 #1156: The Ishikawa Yorumasshi Mystery (Part 1) #1157: The Ishikawa Yorumasshi Mystery (Part 2) #1158: The Detective Boys and the Traditional Dream House #1159: The Whereabouts of the Goodbye #1160: When the Shishi-odoshi Sounds #1161: The Secret's Afterimage #1162: The Case of Ayumi's Illustrated Diary 5 #1163: The Counting Song Heard in the Dark #1164: The 17-Year-Old Truth (The Bloody Knight) #1165: The 17-Year-Old Truth (The Perceptive Devil) #1166: The 17-Year-Old Truth (The Far-Sighted Bishop) #1167: The 17-Year-Old Truth (The Queen's Gambit) #1168: Genta's Casebook of the Eel #1169: The Mystery of the Man-Eating Classroom (Part 1) #1170: The Mystery of the Man-Eating Classroom (Part 2) #1171: The Reason He Became a Butler (Part 1) #1172: The Reason He Became a Butler (Part 2) #1173: It's a Ghost! #1174: The Glassy Water's Surface (Part 1) #1175: The Glassy Water's Surface (Part 2) #1176: The Hero of Ishinomaki #1177: Find the Phantom Giant #1178: The Crimson Skeleton of Mt. Washio (Part 1) #1179: The Crimson Skeleton of Mt. Washio (Part 2) #1180: The Lucky Cat Saw Everything #1181: Buchi Returns a Favor #1182: Arrest That Face #1183: The Interrogation Room 3 #1184: The Red-Brick Warehouse and the Vanishing Kidnapper (Part 1) #1185: The Red-Brick Warehouse and the Vanishing Kidnapper (Part 2) #1186: Girls Day Mystery 4
Yellow background = TV Original
« Season 29	List of episodes	Season 31 »

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 Ran tries to contact Shinichi to ask for help solving the case, while Ayumi calls Conan, but the two… he couldn’t answer because he is busy fishing with Professor Agasa. It seems like the girls will have to solve the case by themselves.
+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, saying that the two girls were good and earnest, while still crying for Satomi Amari’s death. She also states that nobody hates the two at all.
+* Ryuichiro Mita, an Office worker at the Haido Brotherhood Company, remembers that Naoko Shimamura may have interviewed for a position in the company.
+* Shunsuke Yumemura, 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 Yumemura is not the only one out of three to know about snakes:
+* As Ayumi expresses her suspicion toward Yumemura, 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, while the cause of poisoning is then revealed to be the snake venom. What a coincidence!
+* The next one… well… Kasai confesses to the girls that she herself also has knowledge about snakes, as she is working very hard to become an underground snake charming idol. Kasai also notes that the snake she has for the training, Kobu, has its fangs removed, which means 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 see who could be the true culprit, which just further confirms that anyone can 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 ===
@@ Line 97: / Line 107: @@
 === Resolution ===
-<spoiler>The culprit is '''Naoko Shimamura'''</spoiler>
+<spoiler>
+Haibara’s theory: Since the statement of medicines being less effective the more you use it also applies to poison, Haibara suggests that '''Naoko Shimamura''' repeatedly takes the snake venom so she has enough tolerance to survive doses that usually kill a human.
+It is also revealed that Satomi Amari once insulted the snake bred by Naoko Shimamura half a year ago when they argued. The police also receive information that Shimamura got away from the hospital. This further improves the suspect that Shimamura got upset and spent time waiting for an opportunity for revenge.
+However, it is unknown why the girls and the two officers end up being surrounded by the snakes. Suddenly, Kyoka Kasai, Ryuichiro Mita, and Shunsuke Yumemura come to the rescue, as Kasai overheard that Shimamura disappeared from the hospital, and thought that she must have come to the current location, so she called the other two for assistance. Just as we think that the case is over, a black, seemingly venomous snake bites Sonoko. But it turns out that the snake is not even venomous, Sonoko just faint thinking that she was bitten by a venomous one.
+</spoiler>
 == Trivia ==
@@ Line 106: / Line 122: @@
 == In other languages ==
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 == References ==