“I want to know what happens in Detective Conan File 1157!”
“What are the spoilers and theories for Sunday Conan File 1157?”
The previous series, Files 1154-1156, was the hot spring trip and ring storyline.
File 1154, “The Ring and the Hot Spring”
File 1155, “The Whereabouts of the Ring”
File 1156, “The Magic to Find the Ring”
It also felt like a setup chapter for the release of the movie “Fallen Angel of the Highway” (tentative title).
Chihaya Hagiwara, Jugo Yokomizo, and Jinpei Matsuda, who are central to the movie, all appeared there, making the film feel even more anticipated.
This time, the story brings back Kazuha Toyama and Heiji Hattori after their relationship has finally started.
From here on, this article covers spoilers, thoughts, and theories for Detective Conan File 1157, “Under the Starry Sky…”
Spoiler warning: this article discusses the events of File 1157.
About the Latest Detective Conan Chapter
For the newest Detective Conan chapter currently running in Sunday, check the site’s latest-chapter coverage separately.
This article focuses only on File 1157, “Under the Starry Sky…”, and keeps the discussion centered on the chapter’s events and foreshadowing.
Spoilers for Conan File 1157, “Under the Starry Sky…”
The story begins with Ran Mouri speaking on the phone with Kazuha Toyama.
According to Kazuha, she has come to Tokyo together with Heiji Hattori, and their destination is a planetarium. It seems to be a date combined with some Tokyo sightseeing. However, Kazuha says she has something important to tell Ran.
Since Heiji and Kazuha confirmed their feelings at Naniwa Harukas, this is the first episode to show them after they have officially started dating, so their new dynamic is one of the key points to watch.
From here, the first story in the Heiji and Kazuha romance phase begins, with the starry sky becoming the stage for the incident.
On Sunday, Heiji and Kazuha Arrive at the Planetarium
When Sunday comes, Ran and Conan Edogawa wait at the planetarium for Heiji Hattori and Kazuha Toyama.
Because the two had been holding hands at Naniwa Harukas, it is natural to expect them to appear just as close this time. Instead, when they actually arrive, they are standing with a slight distance between them.
Ran notices it right away and senses that something about the spacing between them feels strange.
Heiji then turns to Conan and leaves him with a loaded warning.
Heiji says that he has a major talk for Conan later, and tells him to brace himself. (unofficial translation)
With that ominous line, the planetarium outing starts to carry an unusual tension.
The Band at the Planetarium Is Karakara
Inside the venue, Kazuha spots a four-member mixed-gender band called Karakara.
All four members are visiting in disguise and appear to be there privately. They plan to commemorate the fifth anniversary of the band’s formation by filming a promotional video for their new song on their own phones.
The band members are the following four people.
- Vocalist Hatsune Sukuri
- Drummer Mitsuo Sakaki
- Bassist Hotaru Domura
- Guitarist Tosuke Akashi
The four first met at this planetarium and formed the band here, so the starry-sky setting is also their starting point.
That shared origin later seems likely to connect to the background of the case and the motive behind it.
The Story Explains the New Promotional Video
Hatsune, the vocalist, reveals that she is personally producing the promotional video for the new song. The band name Karakara is connected to the meaning placed in the final part of the new song.
The video also uses old photos of each member from when they were younger. Hatsune says she gathered the photos from people around them and from the members’ phones, but the other three members do not look very pleased about their old photos being used.
The new song is titled “BLUE TIME”. For the moment, the plan is that Hatsune will finish the promotional video and the other members will check its contents later.
Preparations Move Ahead Before the Planetarium Show
Before the screening begins, Hatsune steps away to handle email correspondence with the record company. While she is doing that, the other members also move around the venue.
- Mitsuo goes to buy drinks.
- Tosuke buys popcorn.
- Hotaru looks for goods to throw to fans during a live performance.
Each of them leaves their seat for a different reason.
Kazuha’s seat is K28, in the row directly behind Hatsune. From left to right, the seating order is Heiji, Conan, Ran, and Kazuha.
Heiji and Kazuha had held hands at Naniwa Harukas, yet even though they have only just started dating, they are not sitting next to each other. Ran and Conan both seem to feel something is off.
Momiji Ooka Is Also in the Theater
Momiji Ooka is seated near the front of the planetarium, with her butler Muga Iori beside her.
Momiji is deeply puzzled by the fact that Heiji Hattori and Kazuha Toyama are sitting apart despite supposedly being together.
From Iori’s view, the two are more or less already in a dating relationship.
“The two are almost in a relationship.” (unofficial translation)
However, after seeing the actual seating arrangement, Momiji appears to judge that there may still be room for her to step in.
“There is still room for me to come between them.” (unofficial translation)
The distance between Heiji and Kazuha becomes a factor that stirs Momiji’s feelings again. That uncertainty seems ready to cast a shadow over what follows.
The Planetarium Finally Begins
Just before the screening, Hatsune checks her phone and seems to realize something.
“I see… so that is what this means…” (unofficial translation)
The other members return from their errands, the room goes dark, and the planetarium show begins.
As the starry sky appears overhead, Hatsune eats some popcorn, and in that instant her expression suddenly freezes.
In her mind, Hatsune reacts as if she has been hit by an unexpected move.
“Hey, hey, hey! No way, so that is how you are doing it!” (unofficial translation)
The next moment, she is struck by intense nausea. Unable to hold it back, she cries out and falls into a state of hyperventilation.
At the same time, a strange and unsettling sound rings out around her, like something snapping or being torn: buchi.
The lights quickly come back on, and Hatsune crouches down in obvious distress.
However, the only two people who noticed that odd sound were Kazuha Toyama and Momiji Ooka.
What was the true identity of that sound? What did Hatsune mean when she realized what was going on?
File 1157 ends while leaving behind a sharp sense of wrongness and a major mystery.
To be continued in File 1158…
Characters in Conan File 1157, “Under the Starry Sky…”
The main characters appearing in File 1157, “Under the Starry Sky…”, include Conan Edogawa, Ran Mouri, Heiji Hattori, Kazuha Toyama, Momiji Ooka, and Muga Iori.
The chapter also introduces the band Karakara through Hatsune Sukuri, Mitsuo Sakaki, Hotaru Domura, and Tosuke Akashi, whose shared history at the planetarium becomes important to the case setup.
Thoughts and Theories on Conan File 1157, “Under the Starry Sky…”
This chapter works as the first part of a new series. It begins quietly, but by the end it leaves behind an uneasy atmosphere and several suspicious details.
Here are the main impressions and theory points from File 1157.
File 1157 Thoughts and Theories 1: Heiji and Kazuha’s Distance Feels Strange
In Volume 106, Heiji Hattori and Kazuha Toyama finally confirmed their feelings and officially began dating.
That makes their subtle distance in this chapter stand out a lot. The two were holding hands at Naniwa Harukas, yet at the planetarium they somehow end up seated apart.
What makes it even more interesting is that both of them try to bring up a serious conversation with someone else.
- Kazuha tells Ran Mouri that she has something important to discuss.
- Heiji tells Conan Edogawa to be ready for a major talk.
This does not look like simple embarrassment or a small misunderstanding; it feels like a sign that the two are trying to decide something.
Is this a worry that comes specifically because they are now dating, or is there another reason connected to the case?
Once the content of those conversations is revealed, Heiji and Kazuha’s relationship may move to the next stage, making this one of the biggest points to watch in the series.
File 1157 Thoughts and Theories 2: This Series Starts as a Romantic Comedy Case
Recently, the manga has had movie setup material and Black Organization developments, but File 1157 takes a slightly different direction. It opens as a chapter with strong romantic-comedy energy centered on Heiji and Kazuha.
Honestly, after that recent flow, it would have been easy to expect a foreshadowing-heavy chapter or a more serious development.
However, precisely because Heiji and Kazuha officially became a couple in Volume 106, the story can now move into the phase of showing their distance, awkwardness, and worries after dating begins.
Becoming a couple is not the end. The question now is how they face each other and grow from there.
This series may become a romantic-comedy case that carefully depicts what comes after for Heiji and Kazuha, and it could easily produce a memorable scene.
Alongside the case itself, it will be worth watching where their relationship finally settles.
File 1157 Thoughts and Theories 3: The True Purpose Hidden in Karakara
In this case, the vocalist of Karakara, Hatsune, appears to be poisoned by someone, creating a shocking turn.
The key point is that just before she is poisoned, Hatsune seems to notice something.
“Hey, hey, hey! No way, so that is how you are doing it!” (unofficial translation)
Her realization and the attempted poisoning are almost certainly connected.
The promotional video plan uses old photos of the members, and the other members strongly dislike that idea.
- The old photos may show a fact someone does not want known.
- Through those photos, Hatsune may have reached a certain secret.
That possibility stands out strongly.
Judging from Hatsune’s actions, she may not have been making the promotional video only for the band; she may have been digging into the past to confirm or expose something.
Was she looking into the circumstances behind the band’s formation, the past of one specific member, or a truth directly tied to the incident?
In File 1158, what Hatsune realized and what she learned should become the biggest theory point, along with how it connects to the attempted poisoning.
File 1157 Thoughts and Theories 4: The Snapping Sound May Be the Biggest Clue
The detail that leaves the strongest impression in this incident is the unnatural snapping sound heard just before Hatsune collapses.
Considering the timing, Hatsune may have taken something from her breast pocket and torn it off right before she fell.
In other words, the sound was probably not accidental. It may have been an intentional action Hatsune made while she was still conscious.
If so, the thing she tore could very well become Hatsune’s dying message.
Another important point is that only Momiji Ooka and Kazuha Toyama noticed the sound.
A clue near the heart of the case is being held not by neutral witnesses, but by two major characters in the romance line. That structure may show how this series will connect the mystery with its romantic-comedy elements.
In File 1158, the major moving points should be the following.
- What did Hatsune tear?
- How will Momiji and Kazuha interpret what they heard?
- How will the possible dying message connect to solving the case?
These details are likely to become major turning points.
The Next Chapter, File 1158, Is in Weekly Shonen Sunday Issue 12
The next chapter, Detective Conan File 1158, appears in Weekly Shonen Sunday Issue 12 on February 18, 2026.
The title in the correspondence table is File 1158, “The Eerie Sound.”
Volume 109 coverage will also be relevant once the collected-volume placement and surrounding files are discussed.
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