Light Turner stumbles upon a mysterious notebook that grants him the power to kill anyone whose name he writes within its pages. As he embarks on a mission to eradicate evil, his actions draw the scrutiny of an enigmatic detective, a sinister demon, and a classmate who becomes embroiled in his deadly game. The allure of justice clashes with morality as Light navigates the consequences of his newfound power, leading to a thrilling battle of wits and ethics that will challenge both his mind and soul.