Kaoru Utsumi
(played by Ko Shibasaki) — protagonist
Dedicated police detective and Yukawa's close friend, collaborates on criminal investigations
Misato Hanaoka
(played by Miho Kanazawa) — supporting
Yukawa's ex-wife, maintains a complex but supportive relationship with him
Tetsuya Ishigami
(played by Shinichi Tsutsumi) — supporting
University colleague of Yukawa, provides academic perspective on scientific cases
Canonical Relationships
Family, romantic, and professional connections based on plot evidence.
Tetsuya Ishigami → Manabu Yukawa
(Professional Former Classmate) — A bond of mutual academic respect between two brilliant minds.
Yukawa is described as having high admiration for his 'genius former classmate' Ishigami.
Story Dynamics
Alliances, conflicts, and narrative interactions that evolve throughout the story.
Tetsuya Ishigami → Misato Hanaoka
(Alliance Neighbor Ally) — An indirect protective relationship established through proximity and assistance.
Ishigami lives next door to Yasuko and her daughter Misato, and assists them after the murder.
Kaoru Utsumi → Manabu Yukawa
(Social Close Friend) — A deep personal friendship that complicates their professional dynamic.
Utsumi is identified as Yukawa's close friend who collaborates on criminal investigations.
Story Analysis
A mathematical genius creates an impossible alibi for his neighbor, clashing with a physicist detective in a battle of intellects.
Plot Progression
The Fatal Mistake
— Yasuko kills her abusive husband in self-defense. Her neighbor, Ishigami, witnesses the aftermath and decides to help her escape justice.
The Investigation Begins
— Police struggle with the perfect alibi. Detective Utsumi recruits physicist Yukawa, who initially refuses but returns due to his connection to Ishigami.
Intellectual Duel
— Yukawa and Ishigami engage in a high-stakes battle of wits. Ishigami constructs elaborate deceptions while Yukawa systematically dismantles them.
Tragic Revelation
— Yukawa cracks the case, revealing the shocking truth behind the alibi. The victory is hollow as the reality devastates all parties involved.
