The Mole Song: Final (2021) movie poster

Plot Summary

The Mole Song: Final (2021) Plot Summary Explained

Name: The Mole Song: Final
Genre: Comedy, Action, Crime
Released: 2021-11-19
Duration: 129 min

Release, runtime and language: 2021 · 129 mins · Japanese; Loading streaming availability…
Directed by: Takashi Miike
Starring: Ken'ichi Endô, Sarutoki Minagawa, Mitsuru Fukikoshi, Shin'ichi Tsutsumi, Riisa Naka, Karen Takizawa

Reiji’s final mission is to prevent the smuggling of 600 billion yen of drugs. For his mission, he gets on luxury passenger ship and he faces his strongest enemy to date.

Comedy Action Crime Cast, crew & box office

On this page (6)

1 Where to watch
2 What happens: full plot
3 Plot questions answered
4 Movie threads
5 Movies like The Mole Song: Final
6 Every angle

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Full plot summary · contains spoilers

What Happens in The Mole Song: Final: Full Plot Summary

The whole story of The Mole Song: Final (2021) explained, from the opening scene to the final frame: every key event, every twist and what it all adds up to. Read it as a quick recap before the sequel, to check a scene you missed, or to finally understand what really happened.

Undercover investigator Reiji Kikukawa, Toma Ikuta, known as The Mole, uncovers a bold plan by Shuho Todoroki Koichi Iwaki, head of the Sukiya-kai, to purchase a shipping container filled with 10 tons of amphetamines camouflaged as pasta, in a deal brokered with the Italian Guillotina Family led by Don Razza. The police assign Reiji the task of intercepting the deal and arresting Shuho at the moment of exchange, a mission designed to derail his return to ordinary life and threaten his long-awaited marriage proposal to his girlfriend Junna Wakaki Riisa Naka.

As the transaction unfolds, Shuho’s son Leo arrives to finalize the arrangement, raising the stakes and forcing Reiji to improvise under pressure. He discovers that Shuho is safely aboard the Costa Firenze, a ship flying an Italian flag that prevents a straightforward search by Japanese authorities. Undeterred, Reiji makes his way aboard, while Junna is nearby on a singles’ cruise, trying to put thoughts of their relationship behind her for a while.

Masaya Hiura, “Crazy Papillon” Shin'ichi Tsutsumi, wages a personal vendetta against the drug-connected yakuza and attempts to shoot Shuho. Yet Reiji intervenes, admitting his long-running role as a mole within their circle to ensure Shuho remains alive long enough for a lawful arrest. The tension between loyalty and duty comes to a head as Shuho is finally restrained, and Masaya’s crusade against the drug trade continues to push forward in the shadows.

Back on dry land, Reiji returns to the police force, while Junna’s career takes a surprising turn, culminating in a promotion that elevates her to a supervisory role in Reiji’s life. The story threads together undercover deception, high-stakes law enforcement, and the shifting dynamics of a couple navigating a dangerous underground world, leaving the door open for new questions about trust, loyalty, and what it truly means to come home.

Last updated: February 10, 2026 at 08:32

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Plot questions answered

The Mole Song: Final Plot Explained: Your Questions Answered

The questions people ask most about The Mole Song: Final (2021): what happens in the confusing scenes, why the characters do what they do, the twists, hidden details and what the ending means. Each answer contains spoilers.

Why can't Japanese police search the Costa Firenze ship?

The Costa Firenze sails under an Italian flag, which means Japanese authorities have no jurisdiction to board and search the vessel. This international legal constraint forces Reiji to physically board the ship himself rather than simply waiting for a warrant that would never come.

costa firenze
italian flag
jurisdiction
ship search
japanese police

Why does Reiji reveal his identity as a mole to Masaya?

When Masaya Hiura (Crazy Papillon) attempts to shoot Shuho, Reiji must stop him to ensure Shuho survives long enough for a lawful arrest. By revealing he has been Shuho's mole and ally all along, Reiji destabilizes Masaya and prevents him from killing the target, buying crucial time for the police operation.

reiji kikukawa
mole identity
masaya hiura
crazy papillon
confession

Why does Masaya want to kill Shuho Todoroki?

Masaya Hiura, nicknamed Crazy Papillon, wages a personal vendetta against yakuza members involved in the drug trade. He attempts to eliminate Shuho as part of his crusade against drug-connected criminals, viewing the yakuza boss as a rival and enemy in his war on narcotics.

masaya hiura
crazy papillon
vendetta
drug trade
shuho todoroki

Why is Junna on a singles' cruise during the operation?

Junna Wakaki, Reiji's girlfriend, goes on a singles' cruise to temporarily put thoughts of their complicated relationship behind her. The mission timing forces Reiji to sacrifice his personal life, and Junna attempts to move forward by distancing herself from the uncertainty of his dangerous undercover work.

junna wakaki
singles cruise
relationship
reiji kikukawa

What role does Leo play in the drug deal?

Leo, Shuho Todoroki's son, arrives at the Costa Firenze to finalize the transaction in place of his father. His involvement raises the stakes and forces Reiji to improvise, as dealing with the son rather than the senior yakuza boss creates additional complications for the arrest operation.

leo todoroki
drug deal
shuho todoroki
son
arrest

Why does Junna get promoted to become Reiji's supervisor?

After the operation concludes, Junna receives a promotion that elevates her to a supervisory role over Reiji within the police force. This promotion reshapes their professional dynamic, creating a new power structure they must navigate as both partners and colleagues.

junna wakaki
promotion
supervisor
police force
dynamic

What happens to the 10 tons of amphetamines?

The shipment of 10 tons of amphetamines, disguised as pasta, is thwarted at sea aboard the Costa Firenze. The police successfully halt the drug pipeline and secure the evidence during Shuho's arrest, disrupting the yakuza's major narcotics operation.

10 tons
amphetamines
pasta
shipment
drugs
seized

Why does Reiji accept the mission instead of proposing to Junna?

Reiji accepts the undercover assignment because the police specifically designed the mission to derail his return to normal life and threaten his long-awaited marriage proposal. His duty as a police officer requires him to prioritize the high-stakes capture of Shuho over his personal plans, sacrificing his timeline with Junna for the operation.

reiji kikukawa
proposal
mission
junna
police duty

How does Reiji manage to board the Costa Firenze?

Reiji physically makes his way onto the Costa Firenze despite the jurisdictional complications. Since Japanese police cannot legally search an Italian-flagged vessel, he must infiltrate the ship personally to get close enough to Shuho and execute the arrest at sea.

reiji kikukawa
costa firenze
board ship
infiltrate
arrest

Q10

What happens to Masaya after Shuho's arrest?

After Shuho is arrested, Masaya continues his vigilante crusade against drug-dealing yakuza members. His ongoing war on the drug trade persists even after the immediate operation ends, suggesting continued conflict between his methods and formal law enforcement.

masaya hiura
crazy papillon
vigilante
drug crusade
yakuza

Movie threads

More Movies Like The Mole Song: Final, by Mood & Story

Curated lists built around what makes The Mole Song: Final tick: the same mood, the same kind of story or the same emotional payoff. Each list explains why these movies belong together.

Absurdist Action-Comedies like The Mole Song: Final

High-energy comedies where outrageous action meets quirky humor. If you enjoyed the flamboyant chaos of The Mole Song: Final, explore more movies that blend high-energy action with quirky, absurdist humor. These films offer a similar vibe of lighthearted fun and outrageous scenarios.

humorous
action-packed
quirky
lighthearted
energetic
absurd
Tone: light, whimsical
Pacing: fast

Why these movies?

The story pattern: Stories in this thread typically follow eccentric protagonists entangled in larger-than-life situations, where the plot serves as a vehicle for comedic set pieces and character-driven humor rather than intense drama. The focus is on delivering constant entertainment through a fast-paced, often ridiculous, chain of events.

Why they belong together: These movies are grouped together because they share a core commitment to comedy first, using action and crime elements as a backdrop for humor. They feature a consistently light tone, fast pacing, and a focus on energetic, absurd fun over serious stakes.

Apocalypse Clown

2024

Delta Farce

2007

Crime Busters

1977

Abbott and Costello Meet the Keystone Kops

1955

Men at Work

1990

Loose Loot

1953

Going Overboard

1989

The Best Movie 2

2009

Comedic Undercover Caper Movies like The Mole Song: Final

Hilarious missions where undercover agents navigate absurd criminal worlds. Fans of The Mole Song: Final will enjoy these films featuring bumbling or flamboyant undercover operatives. Discover similar movies with masquerades, chaotic investigations, and a lighthearted take on crime stories.

undercover
masquerade
quirky
investigation
chaotic
humorous
Tone: light, playful
Pacing: fast

Why these movies?

The story pattern: The narrative pattern revolves around a protagonist living a double life, leading to situations ripe with comedic misunderstanding and the constant threat of exposure. The plot is driven by the agent's attempts to complete their mission while their eccentric personality clashes with the criminal environment, often culminating in a chaotic but ultimately successful resolution.

Why they belong together: These films are connected by the central trope of the undercover operation played for laughs. They combine the tension of maintaining a cover with the absurdity of the situations that arise, resulting in a specific blend of crime, comedy, and character-driven humor.

So Undercover

2012

Deep Cover

2025

Undercover Brother

2002

Undercover Blues

1993

Undercover Brother 2

2019

Another Stakeout

1993

Cop Out

2010

Let's Be Cops

2014

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Every angle

The Mole Song: Final (2021) Explained: Plot, Timeline & Characters

Everything about The Mole Song: Final in one place: what happens in the plot summary, the timeline in chronological order, the characters and meaning and a spoiler-free summary. What's After the Movie adds the cast, box office and post-credit scenes.

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