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Kaede is an elementary school teacher and a self-confessed mystery buff. Her grandfather—a former elementary school principal who first introduced her to the joys of the genre—suffers from Lewy body dementia, a condition that sometimes causes him to see strange visions detached from reality. Yet, whenever the conversation turns to mysteries, he transforms into a "master detective," brilliantly unraveling puzzles as if the truth were clearly visible right before his eyes. One day, a colleague named Iwata comes to Kaede with a problem: Shiki, a junior from their high school days, has become entangled in a shocking incident. Faced with the mystery of a murder committed in the restroom of an izakaya, what kind of story will her "master detective" grandfather weave...?

Kaede hears a story from her friend Misaki—an elementary school teacher—about a beautiful teacher at her school who suddenly vanished without a trace. Apparently, she had been dealing with some trouble in her private life... Kaede wastes no time sharing this everyday mystery with her grandfather. What conclusion will her "master detective" grandfather unravel from the puzzle?

While out for a run along the riverbank, Kaede notices a suspicious figure watching her. Unable to ignore the situation—and concerned about the frequent silent phone calls she has been receiving—she confides in her companions, Iwata and Shiki... Then, one day, while running along that same riverbank, Iwata stumbles upon a heated argument between an older man and a young man. He steps in to intervene, only to discover a knife plunged into the young man's abdomen! Meanwhile, a woman who witnessed the entire incident hurriedly flees the scene... Before long, Iwata is arrested on the spot as a suspect by Detective Agatsuma and his team. Can Kaede and her grandfather unravel the mystery behind these events and successfully clear Iwata's name?

As the stalking ordeal plaguing Kaede escalates, Misaki joins her to visit Detective Agatsuma for help. Amidst this turmoil, Kaede visits her grandfather's home, only to be grabbed from behind by an unknown assailant; she loses consciousness after being injected in the neck. She wakes up in the dining room, bound hand and foot, with her mouth taped shut. Before long, she overhears a shocking exchange taking place in the study between her grandfather and someone else.