In which episode does Heiji learn Conan’s true identity?
What makes Heiji realize that Conan is Shinichi Kudo?
Heiji Hattori now knows Conan Edogawa’s identity well enough that he sometimes naturally calls him “Kudo.” He did not know the truth when the two first met, however.
The revelation takes place during the two-part anime case in Japanese episodes 57-58. Heiji reaches his conclusion near the end of Japanese episode 58. In the manga, the case runs from Volume 12 into Volume 13, and the decisive scene is Volume 13, File 1, “Real Self.” The available episode-reference records do not provide international episode numbers or an established English title for the anime case, so this article does not guess them.
This guide explains when Heiji discovers Conan’s identity, how he tests his suspicions, and how their relationship changes afterward. It contains major spoilers for the identity reveal and the events leading to it.
Which episode and volume reveal Conan’s identity to Heiji?
The reveal occurs in the Sherlock Holmes fan gathering case covered by Japanese episodes 57-58 and by Volumes 12-13 of the manga. The case begins before Heiji is certain, so the start of the mystery and the moment of discovery should not be treated as the same point.
- Anime case: Japanese episodes 57-58
- Decisive anime scene: near the end of Japanese episode 58
- Manga case: Volume 12, Files 7-10, and Volume 13, File 1
- Decisive manga scene: Volume 13, File 1, “Real Self”
- Overall manga numbering: Files 117-121
For the reveal itself, the key references are Japanese episode 58 and Volume 13, File 1. Readers looking for the full buildup should begin with Japanese episode 57 or Volume 12, File 7.
The anime spans Japanese episodes 57-58, with the reveal at the end of 58
The first part brings Conan, Heiji, and the other guests to a gathering for Sherlock Holmes enthusiasts. What begins as a quiz-centered event turns into a murder investigation, and the two young detectives quickly become involved.
During Japanese episode 58, Heiji grows increasingly suspicious of Conan’s extraordinary reasoning and behavior. Conan is acting far beyond what Heiji would expect from an elementary school child, and the investigation gives Heiji repeated opportunities to observe him.
The crucial evidence comes from the method Conan uses to present the solution. Watching both parts makes the gradual accumulation of Heiji’s doubts clearer; he does not simply make a lucky guess at the end.
The manga spans Volumes 12-13, with confirmation in Volume 13, File 1
The manga version begins in Volume 12, File 7 and continues through Volume 13, File 1. Heiji confirms Conan’s identity in Volume 13, File 1, “Real Self,” which is File 121 in the overall numbering.
- Volume 12, File 7
- Volume 12, File 8
- Volume 12, File 9
- Volume 12, File 10, “A Lie Revealed”
- Volume 13, File 1, “Real Self”
Heiji’s suspicion has become much stronger by Volume 12, File 10, and the following file supplies the decisive confirmation. Reading the two volumes together makes the changes in his attention and reactions easier to follow.
The case mystery and Heiji’s investigation of Conan advance at the same time. That parallel structure lets the solution to one mystery expose the answer to the other.
Why does Heiji realize Conan is Shinichi Kudo?
Heiji notices that Conan reasons far beyond an ordinary child, deliberately tests what Conan will do, and then sees him use the Stun-Gun Wristwatch and Voice-Changing Bowtie.
This is not merely an accidental glimpse of a secret. Heiji notices a contradiction, creates a situation that encourages Conan to act, and observes the result. He approaches Conan’s identity as a detective would approach any other mystery.
Conan’s reasoning and behavior arouse his suspicion
The first warning sign is Conan’s ability to read the crime scene and enter the investigation. Although he looks like an elementary school student, Conan organizes the evidence quickly and reasons from almost the same position as Heiji.
Conan often acts like a child around adults while quietly feeding them useful hints. To Heiji, another high school detective, the speed and precision behind those hints look unusual. Heiji had also exchanged deductions with Shinichi during their earlier case together, giving him a basis for comparison.
The story suggests that Conan’s thinking may remind Heiji of Shinichi, but that resemblance alone is not proof. At this stage, Heiji has a serious suspicion, not a confirmed identity.
He pretends not to understand in order to test Conan
Although Heiji is close to the solution, he pretends not to understand it so that he can see how Conan responds. If Heiji presented the deduction himself, Conan could remain in the background and preserve his disguise.
Heiji’s feigned confusion leaves Conan needing another way to explain the case. Conan chooses his familiar method: he uses the Stun-Gun Wristwatch to put Heiji to sleep and the Voice-Changing Bowtie to speak in Heiji’s voice.
Heiji does more than wait for an answer; he prompts the person he suspects to reveal the method behind the deception. His trap turns a plausible theory about Conan into something he can test directly.
Waking during Conan’s deduction becomes the decisive evidence
Conan puts Heiji to sleep with the Stun-Gun Wristwatch and begins the deduction in Heiji’s voice through the Voice-Changing Bowtie. Heiji wakes before the performance is over but continues pretending to be unconscious.
From that position, Heiji sees Conan speaking through his voice and can connect the gadget trick with Conan’s exceptional deductions. What could previously have been dismissed as a remarkably clever child now has a concrete mechanism behind it.
“You’re Kudo, aren’t you?” (unofficial translation)
Heiji confronts Conan directly, making clear that he has identified Conan as Shinichi Kudo. Conan can no longer brush aside the question after being observed during the deduction.
This scene does not establish that Heiji immediately receives every detail about the drug or the Black Organization. The core fact confirmed here is that Conan Edogawa is Shinichi Kudo. The usual tools of Conan’s deduction have become the evidence that exposes him.
Heiji does not know Conan’s identity at their first meeting
Heiji does not recognize Conan’s identity during his first appearance, in the diplomat case covered by Japanese episodes 48-49 and Volume 10. He identifies Conan as Shinichi only when they meet again in the Sherlock Holmes fan gathering case.
At their first meeting, Heiji is not yet an ally protecting Shinichi’s secret. He arrives as the western high school detective eager to challenge the eastern high school detective.
In the diplomat case, Heiji sees Shinichi as a rival
Heiji visits the Mouri Detective Agency to test Shinichi’s ability. He gives Conan Chinese liquor, and the group later becomes involved in a case at a diplomat’s home. Under the liquor’s effects, Conan temporarily returns to Shinichi’s body.
Heiji exchanges deductions with Shinichi at the scene and has an error in his own reasoning pointed out. At this point, however, he regards Conan Edogawa and Shinichi Kudo as separate people.
Shinichi’s concern for the truth over a simple contest changes Heiji’s view of him. Shinichi becomes more than an opponent to defeat: he is a detective Heiji wants to face again.
Their second meeting connects the clues
Because Heiji has already witnessed Shinichi’s reasoning firsthand, Conan’s abilities may look even more unnatural during their second case together. The earlier encounter gives Heiji a reference point for Shinichi’s judgment and approach to a mystery.
In the later case, Conan moves toward the heart of the mystery with similar speed. The resemblance adds weight to Heiji’s doubts, but it does not prove the identity by itself.
The similarities in reasoning support Heiji’s suspicion; seeing the Stun-Gun Wristwatch and Voice-Changing Bowtie in use provides the decisive evidence. The two cases therefore connect without collapsing suspicion and confirmation into the same moment.
How much of Conan’s secret does Heiji know?
The scenes discussed here establish that Heiji knows Conan Edogawa is Shinichi Kudo. He also understands that Shinichi is living in a child’s body and needs to conceal his identity.
The story does not establish that Heiji knows every detail of APTX 4869, every member of the Black Organization, or everything Conan has learned. Knowing Conan’s identity is not the same as knowing the complete circumstances behind it.
The certain core is that Conan is Shinichi
What Heiji certainly knows is that Conan’s original identity is Shinichi Kudo. After the revelation, he sometimes addresses Conan as “Kudo,” showing that he acts with that knowledge rather than merely retaining an unanswered suspicion.
Heiji can also cooperate in cases and plans while recognizing that Shinichi cannot openly appear as himself. He is not simply someone who has heard the secret; he can work within the limits that the secret creates.
As another high school detective, Heiji gives Conan a rare partner with whom he can reason on equal terms. Conan does not have to hide the intelligence and experience behind his child identity when they work privately together.
He may not know every detail about the drug or the Black Organization
Heiji understands that circumstances have left Shinichi in a child’s body and that the truth must remain hidden. The evidence discussed here does not confirm, however, that he has a complete account of APTX 4869 or all information concerning the Black Organization.
Later cooperation shows Heiji protecting the secret and helping when needed. It does not, on the evidence available here, show that Conan gave him a comprehensive briefing on every member, operation, and discovery.
Conan often limits what he tells people in order to keep them away from danger. The story suggests that he may tell Heiji what is needed for a given situation, but it does not confirm a fixed boundary.
It is therefore safer to describe Heiji as an ally who knows and protects Conan’s core identity, not as someone confirmed to know every part of the larger conflict.
He keeps the truth from Ran and Kazuha
After learning the truth, Heiji does not tell Ran Mouri or Kazuha Toyama that Conan is Shinichi. Ran has formed her own suspicions, but the story distinguishes that from being told the answer by Heiji.
The evidence discussed here does not establish that Kazuha knows Conan’s identity. Her frequent presence around Heiji does not, by itself, establish that she shares the secret.
Heiji sometimes comes close to calling Conan “Kudo” in front of other people, creating comic tension as Conan reacts. Yet an accidental disclosure could place Ran, Kazuha, or others closer to the danger surrounding Shinichi.
Despite occasional slips, Heiji does not deliberately spread the core secret. Protecting it helps protect not only Conan but also the people around him.
The identity reveal changes Heiji from rival to partner
Once Heiji discovers the truth, his relationship with Shinichi changes from straightforward rivalry into a partnership built around a shared secret.
For Conan, exposure is normally dangerous. Heiji does not exploit what he learns; he understands the need for secrecy and becomes an ally. The threatening moment of discovery therefore also opens the way to a dependable working relationship.
He becomes an equal partner in deduction
After learning Conan’s identity, Heiji becomes someone with whom Conan can exchange deductions without pretending to be an ordinary child.
Both are high school detectives, and their investigative pace is often close. Heiji can understand the direction of Conan’s thinking without always requiring a full explanation, while contributing deductions from his own perspective.
Heiji can also act publicly as a high school detective in situations where Shinichi cannot safely appear. That makes him more than an assistant waiting for instructions; the two can support each other’s reasoning.
Their first meeting emphasizes competition. After the secret is shared, they increasingly stand on the same side of a mystery. The end of the reveal case is also the beginning of their longer partnership.
Calling him “Kudo” creates both warmth and tension
When Heiji calls Conan “Kudo,” the name expresses their closeness while also risking exposure if someone else hears it.
To Heiji, the child standing in front of him is still the detective Shinichi Kudo with whom he once competed. That familiarity can make the real name slip out before he remembers the setting.
Around Ran, Kazuha, and others, Heiji may have to correct himself and return to “Conan.” The exchanges can be funny, but the humor rests on a secret that cannot safely become public.
The story suggests that these slips may reflect how close Heiji has grown to Conan rather than a failure to appreciate the danger. That blend of easy friendship and underlying risk captures the unusual bond created by the reveal.
Summary
Heiji discovers Conan’s identity during the two-part Sherlock Holmes fan gathering case in Japanese episodes 57-58, with confirmation near the end of Japanese episode 58.
- The anime case is in Japanese episodes 57-58.
- The decisive anime scene is near the end of Japanese episode 58.
- The manga case runs from Volume 12, File 7 through Volume 13, File 1.
- The decisive manga scene is Volume 13, File 1, “Real Self,” overall File 121.
- Heiji does not yet know the truth in the earlier diplomat case.
Heiji first notices Conan’s extraordinary reasoning, then pretends not to understand the solution in order to test him. After waking during Conan’s staged deduction, he sees the Stun-Gun Wristwatch and Voice-Changing Bowtie method and turns suspicion into certainty.
The reveal is effective because tools that usually protect Conan’s identity instead expose it. It also changes the emotional direction of the story: Heiji moves from challenging Shinichi as a rival to protecting and assisting him as a trusted partner.
Revisiting the earlier diplomat case before this one makes Heiji’s changing view of Shinichi easier to see. What begins as competition becomes one of Conan’s most important equal-footed detective partnerships.
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