“Want the inside scoop on Detective Conan File 1151?”
“Looking for Sunday Conan Chapter 1151 spoilers and theories?”
In File 1150, the long-anticipated showdown—Rumi Wakasa vs. Kanenori Wakita—finally concluded, and the RUM arc’s biggest mystery was confirmed on-screen: “Wakita Kanenori = RUM.” After years of build-up, the RUM storyline has reached its climax—where does the plot go next?
Starting with this chapter, a new arc kicks off featuring Masumi Sera and Mary—a pivotal appearance.
Below are the spoilers & analysis for Detective Conan File 1151, “Threatening Photo.”
Spoiler warning.
Detective Conan File 1151 “Threatening Photo” – Spoilers
The story opens at the hotel where Masumi Sera is staying with her mother, Mary Sera.
Sera tells Mary she’s heading out for high tea with Ran and Sonoko. Mary, suffering a cough from the side effects of de-aging, worries Sera; it reminds Sera that Mary also sounded nasally the day she went to see Sera’s father, Tsutomu Akai.
1151 Spoiler ① – Sera Meets Up with Ran & Sonoko
Riding in on her bike, Sera is hailed by a man: “Oh! An Altisia—nice taste!” He’s Tomoya Ogasawara; beside him is Rina Nomura. The two are sharing room 204. Ran and Sonoko immediately recognize Rina as a gravure idol.
Ogasawara tells Sera they’ve met before and hands over his card—he’s a newspaper reporter.
1151 Spoiler ② – High Tea at the Hotel
Sera, Conan, Ran, and Sonoko enjoy a formal high tea. At a nearby table sits a masked man—the same guest who had yelled at the front desk earlier about a missing reservation—revealed to be actor Kyosuke Domoto.
Sonoko also confirms that MP Kondo, a cabinet hopeful, is staying at the hotel. It seems both may be meeting the reporter, Ogasawara.
1151 Spoiler ③ – Who Ogasawara Was Meeting
Inside room 204, Ogasawara first meets with MP Kondo of the Sugi faction. He demands 50 million yen to “delete the problematic data,” a clear blackmail ploy; Rina is in the shower at the time.
Later, actor Kyosuke Domoto also visits—and he too is told to pay 50 million yen. Rina is present both times.
1151 Spoiler ④ – What Sera Remembers
Sera wracks her memory about where she’s seen Ogasawara: during the Hotel Serial Bombing case, when she and Mary evacuated outside, Ogasawara was snapping photos on his phone.
Worried he might have captured something dangerous, Sera heads to his room. Meanwhile, Ogasawara strolls the corridor with Rina, boasting that he “made a killing off one treasure shot.” His editor-in-chief, however, forbade publication and made him sign a pledge—so Ogasawara is now using the photo for blackmail.
Their conversation also reveals the two are having an affair.
1151 Spoiler ⑤ – The Murder
Sera rings the bell at room 204 just as Ogasawara returns. “Forgot my phone,” he says, stepping inside.
Sera, Conan, and Rina wait in the hallway, but ten minutes pass with no response. When Rina enters, she finds Ogasawara dead—his head struck with a vase. Soon Domoto and MP Kondo arrive as well. A calculator lies near the body displaying 50,511,070, with the leftmost digit circled in blood.
To be continued in File 1152…
Detective Conan File 1151 “Threatening Photo” – Review & Theories
The new arc opens with hints that we may finally learn more about APTX 4869. Below are quick, SEO-friendly takeaways and theories for Detective Conan File 1151.
1151 Insight ① – Why Is Mary Sera Coughing?
Mary has long been a mystery. The chapter nearly solves one riddle: “Why does she keep coughing despite not having a cold?” According to Masumi, Mary already sounded nasal before she de-aged. Afterward, the cough persisted and never improved.
We’ve also been told Conan’s height hasn’t increased “even 1 cm” since shrinking—time seems frozen physiologically. By analogy, if Mary had a cold at the instant she de-aged, those symptoms may have been locked in. In other words, the cough isn’t a new side effect of APTX 4869; it’s the fixed result of the preexisting cold at the moment of regression.
1151 Insight ② – The “Hidden Power” Behind the Photo
Masumi worries that during the Hotel Serial Bombing, someone may have photographed her and Mary. Yet that photo never surfaced. Enter reporter Tomoya Ogasawara—the most likely person holding it—and the revelation that he was forced to sign a non-disclosure pledge to bury a “treasure shot.”
If that suppressed image involves Masumi and Mary, it suggests a mysterious influence working behind the scenes to keep it sealed. The identity, contents, and current whereabouts of this photo are poised to become a major ongoing clue in the new arc.
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