Sumigahara Uguisu no Ronshou

A girl named Uguisu differs from typical teenagers by spending much of her time in the library and rarely attending classes, yet she consistently achieves perfect test scores. Despite her challenging nature, a peculiar bond forms between her and the narrator. They are assigned an unusual task to determine if the brilliant mathematician Kiryu is truly a magician. This leads them to Kirin Mansion, where Kiryu lives. Two days later, Kiryu is found dead, his head missing. Although the list of possible suspects is small, the findings suggest none are guilty. The mystery raises questions about Kiryu's true identity, the nature of the crime, and whether there is a real perpetrator. These uncertainties are examined through various logical arguments.