Spoiler warning: The discussion below covers the full plot of Detective Conan File 1135 and the unresolved mystery at Monster Mansion.
File 1135 continues the Police Academy flashback set seven years in the past. Young Shinichi Kudo, Ran Mouri, and the five cadets investigate the mansion’s suspicious residents, but the hidden operation is not fully exposed until the next chapter.
Why is the mansion’s monthly electricity bill over ¥30,000? The cadets expose the residents’ day-trader explanation as a lie, but the actual use of the electricity remains unexplained in File 1135.
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File 1135 continues the Police Academy flashback arc that began in File 1134, set seven years in the past.
A young Shinichi Kudo and Ran Mouri have teamed up with cadets Rei Furuya, Kenji Hagiwara, Jinpei Matsuda, Wataru Date, and Hiromitsu Morofushi to probe the eerie “Monster Mansion.”
What did the cadets decipher from the note Shinichi handed over, and what horrors really lurk inside the decrepit estate?
Our summary and theories below cover the events published in Weekly Shōnen Sunday issue 53 (27 Nov 2024).
Detective Conan File 1135 “Cutting the Gordian Knot” – Spoiler
The chapter opens back at the Mouri Detective Agency.
While Kogoro clamps a hand over the burst kitchen tap, Ran speed-dials the municipal waterworks for help.
Watching Conan head downstairs to check the mail, Ran flashes back to her childhood encounter with the Police Academy Team.
File 1135 Spoiler ① – The Cadets Split Up to Gather Evidence
In the flashback, Jinpei Matsuda picks a roadside mailbox and finds an electricity bill topping ¥30,000.
Convinced the residents are hiding something, Matsuda and Wataru Date decide to question them.
Meanwhile:
- Rei Furuya phones Instructor Onizuka about the suspicious residents and talks him around.
- Hiromitsu Morofushi slips into a drugstore to buy camphor mothballs and aluminum foil.
- Kenji Hagiwara borrows Onizuka’s car after telling the mechanic that the instructor has asked him to drive it.
File 1135 Spoiler ② – Face-to-Face With the Mansion’s Residents
Matsuda, Furuya, Date, young Shinichi Kudo, and Ran Mouri ring the mansion’s intercom; three men answer the door.
When Shinichi describes the fiery fish and shadowy snakes he saw the previous night, the trio dismiss it as childish fantasy—until Morofushi demonstrates a “swimming flame” by floating a camphor-and-foil disk across the pond.
Hagiwara adds a sizzling “black snake” firework created through a simple chemical reaction.
The three men protest there’s no proof they staged the phenomena.
File 1135 Spoiler ③ – Entering the Suspects’ Lair
The final piece is a photo that shows a demon mask inside the house.
Furuya promises to expose the trick if the men let them in.
Hagiwara suggests Ran and Shinichi wait in the car, but Shinichi insists, “I’m a detective—I’m coming.” (unofficial translation)
Hagiwara laughs:
Hagiwara: “What a little tough guy.” (unofficial translation)
and stays outside with Ran while the other four cadets head indoors to debunk the haunted snapshot.
File 1135 Spoiler ④ – Why Was the Electric Bill Sky-High?
Inside, Date and Matsuda confront the suspects about their ¥30,000 power bill.
The men open a room packed with humming PCs and claim to be day traders
who leave their rigs running 24/7.
Date asks a question that exposes the “day trader” explanation as a lie. He demands to know what the electricity was really used for, but the chapter ends before the men explain it.
To be continued in Detective Conan File 1136.
Detective Conan File 1135 “Cutting the Gordian Knot” – Review & Theories
This chapter serves as the investigation phase inside the suspicious “Monster Mansion.”
The Police Academy Team is razor-sharp from start to finish, cornering the shady residents with flawless teamwork.
Below are the key takeaways.
File 1135 Review & Theory ① – Unbeatable Five-Man Teamwork
The spotlight is squarely on the five cadets.
Each instantly grasps his role, dividing tasks with military precision while firing off cutting remarks that tighten the net around the three suspects.
It’s a clear display of the five cadets’ teamwork: each person recognizes a role, divides the work, and keeps the investigation moving.
File 1135 Review & Theory ② – Kenji Hagiwara, the True Gentleman
Hagiwara once again proves he’s the team’s heart.
In File 1135, Hagiwara worries about Shinichi and Ran, teases Shinichi, and gives Ran a candy in the car. Those gestures show his considerate side.
He also had a memorable closing scene in The Bride of Halloween. That film appearance makes it tempting to expect another standout moment here, but this chapter does not establish how the arc will end.
Expect him to land another memorable moment when this mini-arc wraps.
File 1135 Review & Theory ③ – Why the Electric Bill Is Sky-High
The chapter’s biggest riddle is the ¥30,000 power bill.
A likely explanation ties back to the “mountain bayberry” note from File 1134: an indoor grow operation.
All-day grow lighting could explain the high bill; the article’s theory is that the computers are a cover story rather than a sufficient explanation.
File 1136 may connect that theory to the code word “Yamamomo,” but File 1135 leaves the answer open.
The article below provides an in-depth overview of Detective Conan Volume 107.
Further reading (contains spoilers): Jinpei Matsuda's death and relationships.
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