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Sumigahara Uguisu no Ronshou

鷲見ヶ原うぐいすの論証

Uguisu Sumigahara is no ordinary teenage girl. She spends most of her time in the library, rarely attends class, yet consistently achieves perfect scores on exams. Despite her difficult personality, the narrator develops a strange relationship with her.

One day, they are entrusted with a peculiar request: to investigate whether the genius mathematician Kiryu is actually a magician. They travel to the Kirin Mansion, where Professor Kiryu resides. Two days later, the professor is found as a headless corpse. Although the suspects are limited, the results are intriguing—everyone appears to be innocent. Is the professor truly a magician? Is this even a murder case? Are there any victims, or is there an actual culprit? These doubtful questions are challenged through different logical arguments.

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