“I want to know what happens in Detective Conan File 1158!”
“What are the spoilers and theories for Sunday Conan File 1158?”
A case breaks out at a planetarium in Tokyo.
The previous chapter brought back Heiji Hattori and Kazuha Toyama after a long gap, with their finely balanced distance as the main highlight.
This time, the story moves into the second chapter of the season, and it is the investigation part.
From here on, this article covers spoilers, theories, and impressions for File 1158, “The Eerie Sound.”
From this point forward, there are spoilers and theories for Detective Conan File 1158, “The Eerie Sound.”
Please proceed only if you are comfortable with spoilers.
About the Latest Detective Conan Chapter
For readers following the latest Detective Conan manga chapter in Weekly Shonen Sunday, this article focuses specifically on File 1158 and its case clues.
Spoilers for Conan File 1158, “The Eerie Sound”
The chapter opens with Hatsune Sukuri, the vocalist of the popular band Charachara, suddenly starting to suffer in the planetarium.
The screening is stopped immediately. Conan Edogawa and Heiji Hattori rush straight over to Hatsune.
Because there is a strong garlic-like smell near Hatsune, Heiji judges that organophosphate poisoning from an agricultural chemical is highly likely.
Hatsune is still conscious, so she is kept resting inside the venue until the ambulance arrives.
The Identity of the “Snap” Sound Kazuha and Momiji Heard
Momiji Ooka, who had come to observe Heiji and Kazuha, appears with her butler Muga Iori.
Momiji and Kazuha testify that they heard a small snapping sound just before Hatsune began to suffer.
When Conan checks the scene, he notices that a single small paper match has fallen near Hatsune.
A closer look reveals several suspicious details.
- The remaining paper matches and their case are under Hatsune’s seat.
- Among the six matches, only the third one from the left has been torn off.
- The number “3104” is printed on the case.
These points make the match feel more deliberate than accidental.
The question becomes whether this torn-off match was a message Hatsune left behind.
Takagi and Megure Join the Scene as the Investigation Moves Forward
Before long, Juzo Megure and Wataru Takagi arrive, and the investigation begins in earnest.
The three suspects believed to have had a chance to target Hatsune are the other band members.
- Mitsuo Sakaki, the drummer
- Hotaru Domura, the bassist
- Tosuke Akashi, the guitarist
Just before the incident, each of them had handed something to Hatsune.
- Akashi: popcorn
- Domura: goods bought at the shop
- Sakaki: iced tea without gum syrup
The poison test results show poison on Hatsune’s hand, the popcorn container, and the iced tea cup.
However, nothing is detected from the tray, and only a tiny reaction appears on the paper match and its case.
Muga Iori’s testimony also clarifies that Hatsune had no contact with fans before the screening began.
That means the poison was most likely passed to her directly or indirectly by one of the band members.
The Seating Order and the Mystery of the Paper Match
The three band members are questioned next.
From Hatsune’s point of view, the seating arrangement at the time was clear.
- Akashi was on her left.
- Hotaru was on her right.
- Sakaki was behind her.
They explain that this matched their usual band formation, with the vocalist in the center.
The paper match turns out to have originally belonged to Akashi.
Hatsune had apparently stolen the match case because it had Akashi’s passcode written on it, allowing her to get student-days photos saved on his phone.
The “3104” on the match case did not have a special hidden meaning; it was Akashi’s smartphone passcode.
Even so, the reason the third match from the left was torn off remains unexplained, and that torn position may become a major clue.
The Hint Heiji and Conan Find in the Meaning of the Name
During the questioning, the band name Charachara also comes up.
Only Hatsune knew the meaning of the name, and she had explained that she chose it because it suited the group perfectly.
“It is a name that fits us perfectly.” (unofficial translation)
Momiji points out that “chara” can also refer to a type of incense.
“Chara is also the name of an incense.” (unofficial translation)
Then Kazuha casually says that she feels hot and may have worn too many layers.
“It feels kind of hot… Maybe I wore too many layers.” (unofficial translation)
That offhand comment immediately changes Heiji and Conan’s expressions.
It seems the pieces connect for them.
- “Chara” as incense
- Layered clothing
- The torn-off match
- The snapping sound
By linking those clues, Heiji and Conan appear to have reached the truth behind the case.
File 1158 ends by pushing the story toward a solution built around the meaning of the name and the torn match.
Continued in File 1159.
Characters in Conan File 1158, “The Eerie Sound”
The major characters appearing in File 1158, “The Eerie Sound,” include Conan Edogawa, Heiji Hattori, Kazuha Toyama, Momiji Ooka, Muga Iori, Juzo Megure, and Wataru Takagi.
The case also centers on the members of the band Charachara: vocalist Hatsune Sukuri, drummer Mitsuo Sakaki, bassist Hotaru Domura, and guitarist Tosuke Akashi.
Impressions and Theories for Conan File 1158, “The Eerie Sound”
This chapter is a full investigation chapter. The small drawings and casual lines are packed with clues, so it feels like a chapter that rewards a careful reread.
Here are the points that stood out most after sorting through the clues from File 1158.
Theory 1: Is “Layered Clothing” the Decisive Hint?
At the end of File 1158, Heiji and Conan react to Kazuha’s words about wearing too many layers.
The part to focus on is the seating scene on the final page of the Sunday version.
If you look closely, the cup placed at Heiji’s seat seems slightly thicker than Conan’s cup, with more drawn lines.
In other words, the cup appears to be in a “layered” or stacked state.
That seat corresponds to Sakaki’s position behind Hatsune.
A stacked cup equals a poison transfer trick, which points toward Sakaki as the culprit.
This reading makes Sakaki look much more suspicious.
Theory 2: Was the Trick a Stacked Poison Cup?
The possible trick would work like this.
- Sakaki prepares an empty cup with poison on it.
- He stacks it with a normal cup.
- When he hands the drink to Hatsune, he makes her hold the poisoned cup.
- The poison transfers to Hatsune’s hand.
- She eats popcorn with that hand, and the poison enters her body.
This would line up with the forensic results.
- Poison is on Hatsune’s hand.
- Poison is on the popcorn container and cup.
- No poison is found on the tray.
The stacked-cup theory neatly explains why the tray could stay clean while the hand, popcorn container, and cup all show poison.
Still, this could be a misdirection. The scene has already been checked after the incident, and the cup in the final panel is not necessarily the culprit’s actual cup.
There is also the possibility that the author is intentionally making the clue look easy to read.
In Detective Conan, an obvious hint is often twisted one more step, so the stacked cup could still turn out to be part of a reverse trick. The next chapter should clarify how far this clue can be trusted.
Theory 3: Could the Wanted Criminal from the Start of File 1157 Connect to the Dark Side of the Music Video?
The biggest question in this case is why the culprit wanted to stop Charachara’s music video from using student-days footage and old photos.
Hatsune was unusually insistent about using old photos in the music video, and the other members clearly hated the idea. When the reaction is that direct, it feels like more than simple embarrassment over old memories.
Hatsune also collapses right after seeming to realize something, so there may be something in the music video material that was never meant to be seen.
That brings back the wanted criminal mentioned by Heiji at the start of File 1157. It looked like setup for a romantic comedy chapter, but it may also have been setting the mood for this case.
The theory would be this.
- A wanted criminal, or someone connected to that person, appears in the student-days footage or photos.
- Alternatively, one of the members had a past connection to that person.
- If that became public, the damage would go far beyond the band’s image.
- That is why the culprit needed to silence Hatsune in order to stop the music video.
Heiji also hinted to Conan that he had a serious story to tell later, which makes this possibility feel stronger.
If this theory is right, the motive is not jealousy or a simple clash inside the band, but a deeper secret tied to concealing the past.
In File 1159, the most interesting point may be how “chara” as incense, patterns, the match’s shape, the music video material, and the wanted-criminal thread all fit together.
File 1159 Comes in Weekly Shonen Sunday Issue 13
Detective Conan File 1159 is scheduled for Weekly Shonen Sunday Issue 13, released on February 25, 2026.
The next chapter should continue the solution to the match mystery and show what the title “It Is Still Okay…” is pointing toward.
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