Want the full scoop on Detective Conan (Case Closed) File 1139?
Searching for Sunday Conan chapter 1139 spoilers and deep-dive analysis?
The Nagano “mystery fire” arc that began in File 1137 has reached a grim turning point.
The previous installment (File 1138) ended with the first true casualty of the unexplained blazes.
File 1139 shifts into full investigation mode as Conan and the Nagano Prefectural Police race to uncover the arsonist’s method and motive.
Below is our spoiler-packed breakdown and early theories for Detective Conan File 1139, “Aftermath of the Flames.”
Detective Conan File 1139 “Aftermath of the Firestorm” – Spoilers
The victim in File 1138 was Yūta Kitakura, riding alone in a classic Mini.
When driver Shichisuke Kasai suddenly doubled over with stomach pain, the convoy changed course; Kitakura leaned his right arm out the window—and it burst into flames.
South of the crash site, Kasai and passengers Kaori Nanjō and Tamaki Itō were traveling in the follow-up van.
Kitakura’s Mini lacked shoulder belts, so the head-on collision with a tree left him bleeding from the scalp before paramedics arrived.
File 1139 Spoiler ① – Nagano’s Finest Arrive on Scene
Inspector Yui Uehara is joined by the prefecture’s ace duo, Kansuke Yamato and Takaaki Morofushi, at Conan’s request.
Because surveillance footage shows flames erupting after a mysterious car overtook the Mini, they treat the crash as potential foul play.
File 1139 Spoiler ② – Interviewing the Remaining Three Witnesses
Detectives question front-seat passenger Kaori Nanjō, driver Shichisuke Kasai, and back-seat rider Tamaki Itō.
Tamaki suggests Kasai’s stomach cramps came from ice cream she had stored in their lodge’s freezer.
The Detective Boys then brief Yamato and Morofushi on the local legend of the “Corpse-Lighter.”
Police also watch two key videos: Tamaki’s sleeve fire and the smoke that rose from Kaori’s back.
File 1139 Spoiler ③ – Re-examining the Fatal Lodge Fire Three Months Ago
The group recounts the night Takehiko Nanjō died.
All five members of the Compass Detective Club were scouting a haunted lodge.
Tamaki dozed off first; Kaori, Kasai, and Kitakura drove out for more drinks, leaving Takehiko with the sleeping Tamaki.
A quake struck while they were gone.
Worried, Kitakura rushed back ahead of the others.
When Kaori and Kasai returned, they found the lodge ablaze, Kitakura cradling Tamaki outside, and no sign of Takehiko.
Days later, investigators discovered his body beneath a toppled cabinet.
File 1139 Spoiler ④ – Personal-Effects Check Reveals New Clues
During a systematic search:
- Kasai is carrying matches, not a lighter.
- Tamaki owns a powerful foreign laser pointer and a coin pouch.
- Kaori has ethanol-based sanitizer and a charred smartphone sealed in a plastic bag—its background photo shows all five friends wearing detective badges in childhood.
Yamato and Morofushi impound the items and send everyone (except Conan) back to the station, convinced they now know the arsonist’s method.
File 1139 Spoiler ⑤ – Yui’s Childhood Flashback
In the patrol car, Inspector Uehara tells the Detective Boys she, Yamato, and Morofushi were childhood friends—though she’s six years younger.
She recalls a sports-day relay where first-graders received red ribbons.
After she cried over missing first place, Kansuke and Takaaki teamed up to win one for her.
Ai Haibara「Ah, now I see why you fell for him…」
Ayumi Yoshida「For which one?」
Ai Haibara「For Kansuke, obviously」
Uehara turns beet-red.
File 1139 Spoiler ⑥ – Conan and the others finally…
Back at the crash site, the trio notice the Mini’s rear door sill is spotless—no road grime. In nearby brush they also find tape the same color as the Mini’s paint. Morofushi quotes Confucius:
Takaaki Morofushi「Turn misfortune into advantage」
At that moment Conan retrieves the Compass Detective Club badge from the Mini’s glove box and declares it the motive behind the attacks.
File 1140 will deliver the truth behind Nagano’s mystery fires—stay tuned!
Detective Conan File 1139 “Aftermath of the Firestorm” – Review & Theories
The third chapter of the Nagano “mystery-fire” arc finally brings the prefecture’s ace detectives back into play.
File 1140 will almost certainly wrap up the case, but for now here are our quick impressions and speculation on File 1139.
File 1139 Review & Theories ① – Kansuke Yamato & Takaaki Morofushi Rejoin the Story
After a blink-and-you-miss-it cameo in File 1137, Yamato and Morofushi step fully onto the stage at last—long overdue!
This chapter shows the pair treating Conan as a bona-fide partner: they leave everyone else at the patrol cars and keep only Conan beside them at the crime scene.
That mutual respect feels like deliberate setup for the 2025 movie “One-Eyed Afterimage.”
File 1139 Review & Theories ② – Yui Uehara’s Bond with the Two Detectives
We learn Yui is six years younger than her childhood friends Kansuke and Takaaki. The flashback of grade-school Kansuke winning a red relay ribbon for a teary first-grader Yui is downright swoon-worthy—especially seeing him with both eyes. If the film revisits those carefree days, the emotional payoff could be huge.
File 1139 Review & Theories ③ – When Yui Fell for Kansuke
The flashback quietly confirms Yui has carried a torch for Kansuke since first grade.
Decades have passed—she even married and divorced in the interim—yet nothing came of that childhood crush.
Classic Conan melodrama, and a sweet moment for long-time fans.
File 1139 Review & Theories ④ – The Most Suspicious Item?
The inventory check turns up several intriguing objects, but Tamaki’s foreign-made laser pointer tops the list. Higher-output lasers can ignite certain fabrics or accelerate burning—exactly the kind of “invisible trigger” this case needs.
Combine that with Kasai’s missing electronic lighter (silent ignition) and you have a plausible method for Kaori’s back fire.
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