When Hajime enrolls in a private prep school to boost his low grades, he stumbles upon a threatening letter--and the beginning of a murder mystery. The master sleuth is hot on the case, and he determines the cause of death is suicide. But things aren't always what they seem. Hajime is suddenly unsure of his own deduction, and feels that he may have made a grave error. He devises a test to flush out the real killer, revealing a web of revenge, deceit, corruption and lies.