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The murder mystery at Itsuki Koizumi's villa (Remote Island Syndrome) in "The Melancholy of Haruhi Suzumiya" is ostensibly a "murder case at a mansion on a remote island," but in reality, it is a fake incident staged by Koizumi and his associates for Haruhi's benefit. Haruhi believes that "interesting beings like aliens or espers don't exist in the real world" and loathes boredom. Meanwhile, the "Agency" to which Koizumi belongs knows that Haruhi possesses the power to influence the world itself. Therefore, to keep Haruhi from getting bored, the Agency prepares "extraordinary events" within a safe range inside reality. That remote island is one of them. A mansion cut off by a storm, suspicious characters, a murder case—. Everything is orchestrated as a stage Haruhi would enjoy, and in reality, no one has been killed. In short: Haruhi: "A murder! How exciting!" Koizumi: "I'm glad you're enjoying yourself." The Agency: "We managed to prevent the world from being rewritten again..." It is a very unique world-building setup. While a normal mystery would be a "story about solving a murder," in Haruhi's world, it is a story where **"those around her stage even a murder case just to keep a girl who could change the world from getting bored."**
Haruhi Suzumiya Leader of the SOS Brigade. Possesses intense curiosity and loves extraordinary events and mysterious phenomena above all else. Faced with the situation of a remote island, a mansion, a storm, and a murder, she actively begins investigating while enjoying the incident. She herself is unaware that she possesses power enough to influence the world. For Haruhi, this incident is an "exciting event" to escape from boring daily life and have fun.
Kyon A member of the SOS Brigade and the story's narrator. A perfectly ordinary high school student with no special powers. However, while being dragged around by Haruhi, he observes the abnormal events occurring around her from the closest vantage point. On the remote island, he gets caught up in the murder case and ends up chasing the incident alongside Haruhi. While noticing that the people around him are hiding something, he tries to view the situation calmly until the end.
Itsuki Koizumi Vice-commander of the SOS Brigade. He has a bright, refreshing personality and is usually relatively tolerant of Haruhi's actions. His true identity is a member of the "Agency," an organization that monitors and protects Haruhi Suzumiya. He understands that dangerous changes could occur in the world if Haruhi gets bored, and keeping her entertained is one of his important roles. This incident on the remote island is also one of the setups prepared by the "Agency" for Haruhi.
Yuki Nagato A member of the SOS Brigade. Taciturn and showing almost no emotion, she always acts calmly. Her true identity is a "Humanoid Interface for Contact with Organic Lifeforms," sent by the Data Overmind to observe Haruhi Suzumiya. She possesses information processing capabilities and special powers different from humans, allowing her to grasp abnormalities that ordinary humans cannot perceive. She does not become emotional about the incident on the remote island and quietly observes the surrounding situation.
Mikuru Asahina A member of the SOS Brigade. She has a quiet, gentle personality and was forced into joining the SOS Brigade by Haruhi. Her true identity is a "Time Traveler" from the future. She acts to observe events occurring in the present, and Haruhi Suzumiya's existence is one of her targets for monitoring. She is not good with scary or dangerous things and feels intense fear even during this murder case. Despite being a supernatural being, she is the person in the SOS Brigade who reacts most like an ordinary human.
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Release Date 2026.09.13 / Last Updated 2026.09.13