Suspect X

A reclusive mathematics teacher lives next door to a single mother and her daughter, whose seemingly idyllic life is shaken when the mother's abusive ex-husband is killed by the family in self-defense. As Detective Kaoru Utsumi investigates the murder, she teams up with the brilliant but eccentric former classmate of the accused, Professor Manabu Yukawa, to unravel the web of clues and uncover the truth behind the tragic events that unfolded. But as they dig deeper, a complex battle of wits ensues between Ishigami's clever attempts to protect his friends and Yukawa's relentless pursuit of justice.