Character Relationship Map: MIU404

Characters

• Ai Ibuki (played by Go Ayano) — protagonist

  Ai Ibuki is a police officer working at a police substation who applied to join the Mobile Investigative Unit but was not accepted. Although he is in excellent physical condition, he lacks detective k...

• Kazumi Shima (played by Gen Hoshino) — protagonist

  Kazumi Shima is an intelligent detective selected as a new member of the Mobile Investigative Unit. He has excellent observation and communication skills, but does not trust other people and cannot fi...

• Yohito Kokonoe (played by Koshi Mizukami) — supporting
• Kuzumi (played by Masaki Suda) — supporting
• Yuzuru Kikyo (played by Kumiko Aso) — supporting
• Gaku Narikawa (played by Ouji Suzuka) — supporting
• Kohei Jinba (played by Jun Hashimoto) — minor

Canonical Relationships

Family, romantic, and professional connections based on plot evidence.

• Ai Ibuki → Kuzumi (Pursuer & Fugitive) — Ibuki operates within the law enforcement structure tasked with apprehending Kuzumi.

  "Suspecting that Kuzumi is the culprit, Shima and his team set out to find him."

• Yohito Kokonoe → Yuzuru Kikyo (Inter-agency Collaborators) — Kokonoe and Kikyo coordinate intelligence sharing to address overlapping criminal threats.

  "Ep 9 Kikyo uncovers Tatsui gang surveillance, Kokonoe coordinates pursuit of Narikawa."

Story Dynamics

Alliances, conflicts, and narrative interactions that evolve throughout the story.

• Kazumi Shima → Kuzumi (Hunter vs Target) — Shima leads the pursuit of Kuzumi, viewing him as a critical suspect linked to escalating crimes.

  "Ep 10 MIU suspects Kuzumi after discovering Etori's orders, Ep 10 Shima and team set out to find him."

• Ai Ibuki → Kazumi Shima (Foil & Mirror) — Their partnership serves as a narrative mirror, contrasting Ibuki's impulsive drive with Shima's guarded pragmatism.

  "Ep 6 Ibuki probes Shima's past after hearing 'partner killer', Ep 11 they grow distant but take matters into their own hands."

• Kazumi Shima → Kohei Jinba (Senior Partners) — Shima relies on Jinba's field experience, with Jinba's incapacitation in Ep 11 forcing Shima to adapt his leadership approach.

  "Ep 7 Jinba encounters a wanted felon, Ep 11 Jinba's coma impacts Shima's operational decisions."

• Ai Ibuki → Kohei Jinba (Teammates) — Jinba serves as a steadfast field partner, whose injury in Ep 11 destabilizes the unit's cohesion.

  "Ep 7 Jinba encounters a wanted felon during a routine route, Ep 11 Jinba falls into a coma causing MIU to fracture."

• Yuzuru Kikyo → Kazumi Shima (Informant/Partner) — Kikyo provides crucial intelligence to the MIU, operating as a key civilian ally in the investigation.

  "Ep 9 Kikyo learns the Tatsui gang planted a bug in her house, Ep 10 MIU investigates related criminal networks."

• Yohito Kokonoe → Gaku Narikawa (Officer vs Criminal) — Kokonoe actively pursues Narikawa, driven by a commitment to prevent further criminal acts.

  "Ep 9 Kokonoe resolves to catch Narikawa before he commits more crimes."

• Kazumi Shima → Gaku Narikawa (Target vs Suspect) — Shima's unit investigates Narikawa's potential ties to the broader criminal network.

  "Ep 10 MIU suspects Kuzumi but tracks Etori's network, Ep 9 Kokonoe targets Narikawa."

• Ai Ibuki → Yuzuru Kikyo (Collaborators) — Kikyo's civilian investigations occasionally intersect with MIU operations, fostering a cooperative dynamic.

  "Ep 9 Kikyo's investigation intersects with police work, Ep 10 MIU uncovers Etori's criminal orders."

• Kohei Jinba → Gaku Narikawa (Encounter vs Fugitive) — Jinba's direct encounter with a wanted felon in Ep 7 highlights the immediate threat posed by Narikawa's network.

  "Ep 7 Jinba encounters a wanted felon, Ep 9 Kokonoe resolves to catch Narikawa."

• Ai Ibuki → Gaku Narikawa (Pursuer vs Fugitive) — Ibuki's unit actively tracks Narikawa, placing him in direct opposition to the fugitive's operations.

  "Ep 9 Kokonoe targets Narikawa, Ibuki operates within the same MIU404 unit pursuing criminals."

Story Analysis

Traces the procedural investigation from unit formation to a fractured manhunt, highlighting themes of trust and systemic corruption.

Plot Progression

1. Episodes 1-2: Unit Assembly & Initial Alert — The season opens with the formation of MIU404 and the immediate deployment of Shima and Ibuki. Early investigations reveal a murder suspect on the run, establishing a tense operational baseline and se...
2. Episodes 3-5: Undercover Operations & Rising Stakes — The duo transitions to deep cover assignments to prevent convenience store robberies. Multiple simultaneous targets force tactical adaptations, escalating operational complexity and introducing early...
3. Episodes 6-8: Past Secrets & Serial Connections — Personal histories surface as Ibuki investigates Shima's reputation and uncovers his mentor's controversial arrest. A storage container body links to an unsolved serial murder case, deepening the narr...
4. Episodes 9-10: Surveillance Discovery & Network Unraveling — Civilian intelligence reveals Tatsui gang surveillance, while MIU uncovers Etori's hierarchical command structure. The investigation pivots toward identifying Kuzumi as the suspected mastermind, trigg...
5. Episodes 11-12: Fracture & Manhunt — Jinba's coma destabilizes the unit, forcing Shima and Ibuki to operate outside protocol. The partnership strains under pressure as the manhunt reaches its climax, leaving the team fractured but determ...