Spoilers for the full Scarlet School Trip case: the culprit, the film-credit mystery, and discussion of a character’s death by suicide.
Michio Deguri is not the killer in The Scarlet School Trip. He died before the murders began. He is the creator whose work and apparent omission from a film’s credits sit behind Riki Agata’s mistaken motive.
That distinction is the key to the case. Deguri cannot act in the present, yet his name, coded messages, and creative work seem to surround every crime. Understanding him explains why the murders take that form and why solving the mystery brings so little comfort.
Who was Michio Deguri?
Deguri belonged to the special-effects research club at Gion University of Art alongside Keiko Kurachi, Riki Agata, Minehito Mayama, Shinya Ihaya, and Taro Nishiki. He worked on costumes and creature designs and hoped to become a professional manga artist.
His self-published manga became the basis for the group’s graduation film, Kurenai no Shura Tengu (tentative title). This is the film within the story, separate from The Scarlet School Trip itself.
For the other five, the film became a route toward recognition. For Deguri, using the work without a form of agreement he could accept damaged something more personal. It was a story he had wanted to bring into the world as his own.
He angrily asked for his name to be left out. That earlier decision matters when the work is later remade: the missing credit is not a dispute that begins at the preview. It reopens a wound from the group’s student years.
The friends who moved forward without him
Kurachi becomes an actress, Ihaya an actor, Mayama a director, and Agata a composer. Their success sits beside Deguri’s abandoned ambition and later work at a small design office.
The contrast helps explain why recognition matters so much to him. The people who shared his university life appear to have moved forward through a work rooted in his imagination, while his own dream has stalled.
Kurachi’s enduring feelings for Deguri add another painful layer. There is affection in the history as well as resentment. It is not enough to call the group heartless and stop there; the eventual reveal depends on intentions that failed to reach the person they concerned.
What went wrong with the credits?
When Kurenai no Shura Tengu is remade, Deguri asks for his name to appear. At the first screening, he cannot find it. The case links his subsequent death by suicide to his belief that he has been excluded again.
To him, a credit could have meant acknowledgment that the story was his creation. Its apparent absence repeats the original hurt at a point when his hoped-for career has already slipped away. The film’s backstory gives that reaction a context; it is not simply an argument about a line of text.
The tribute that failed to become readable
The cruel revelation is that his friends had planned to include his name through a code in the arrangement of the credits. Deguri liked codes, so the device was meant to acknowledge him in a way connected to that interest.
A spacing error prevented the intended message from working. Deguri saw absence where the others had intended a tribute. Agata later interpreted that same apparent absence as deliberate betrayal.
That is why the credit arrangement is more than a clever puzzle. The solution demonstrates that a message existed, but it cannot make the message arrive in time. The distance between intention and what another person actually receives becomes the tragedy at the center of the case.
The explanation also does not erase Deguri’s earlier grievance about the use of his work. A kind intention in the remake can coexist with a relationship already damaged by years of resentment. The failed tribute is especially bitter because it was supposed to cross that distance.
Why Agata’s crimes point toward a dead man
Riki Agata is the culprit. He believes that the others deliberately denied Deguri his credit and treated him with contempt. Acting on that misunderstanding, he turns the dead man’s name and work into the framework of the murders.
The coded warnings, the mark resembling four black squares, the fatsia leaves, and the tengu imagery all make Deguri seem present without placing him physically at a scene. The murders borrow from the imaginative world of his manga and its film adaptation.
This is the difference between a person’s influence on a mystery and their ability to commit its crimes. Deguri’s name is central to the staging because Agata uses it. Its recurrence does not make Deguri a surviving or supernatural killer.
Friendship distorted into a motive
Agata’s anger grows from caring about Deguri, but that feeling does not validate his understanding of the credits or justify what he does. He acts without knowing about the intended code and helps make Deguri’s legacy more tragic.
There is a painful contradiction in the staging. A man who resents the mistreatment of his friend’s work proceeds to use that work as an instrument of murder. He claims to act for Deguri while making the dead creator’s name seem threatening.
The reveal answers two different questions at once: who is committing the crimes, and what did the credits actually mean? Agata can be identified before his justification survives scrutiny. Solving the second question strips the revenge story of the certainty on which he built it.
Why Deguri changes the tone of The Scarlet School Trip
The school trip is a major step forward for Shinichi Kudo and Ran Mouri. Its Kyoto setting and their time together give the storyline warmth and anticipation. Deguri’s history runs in the opposite direction, toward a dream and a relationship that can no longer be repaired.
That contrast gives the mystery its lingering sadness. As Shinichi and Ran find a way to move forward, the adults’ case reveals what happened when people misread each other and never managed to make themselves understood.
Deguri’s codes and the credit arrangement are clues resolved within this case. They are not established here as a new Black Organization mystery or an open thread requiring a later identity reveal. Their payoff concerns the culprit, motive, staging, and shared past of the university group.
Where to read or watch it
The Scarlet School Trip spans Files 1000-1005 in Volumes 94-95. The anime adaptation comprises The Scarlet School Trip (Bright Red Arc) (1 Hour Special), Episodes 982-983 (Japanese episode 927), and The Scarlet School Trip (Red Love Arc) (1 Hour Special), Episodes 984-985 (Japanese episode 928).
On a return to the case, the early symbols carry more than menace. They point toward an absent creator and a message he never received. The mystery has an answer, but the friendship behind it has lost the opportunity for one. That is why Deguri matters even though he is never the person moving through the present-day crime scenes.
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