⸸ 寄生獣 Kiseijuu ⸸

"We are not so different,
you and I."

Parasite Signal · Detection Active

[ SCANNING ]

PARASYTE THE MAXIM

The Parasitic Beasts

THE SETTING · EAST FUKUYAMA CITY

"They came from the sky. The government knew. The public didn't."

Near-future Japan. Parasitic organisms arrived as spores falling from the sky, burrowing into human hosts, consuming brains, taking over bodies. Most succeeded. The result: a hidden population of predators wearing human faces, hunting the rest of us for food.

The government knows. They've known from the start. Gag orders. Cover stories. Suppressed investigations. The public remained ignorant—until a parasite rampaged through a high school, killing seventeen. Now paranoia spreads. The government circulated a rumor: pluck a person's hair to check if they're human. It was a lie. But people believed it.

Somewhere in East Fukuyama City, a human mayor named Takeshi Hirokawa leads a cabal of parasites. He believes humanity is poison. He believes the parasites are the cure. And somewhere else, a high school student named Shinichi Izumi carries a parasite in his right arm—the infection failed, and the parasite became a symbiote instead of a predator.

◆ THE PROTAGONISTS ◆

Hybrids & Humans

The boy with the parasite arm. The girl who senses them. The symbiote who learned to care.

Specimen N°.01

Student · Migi's Host · Enhanced Human

Infection failed—earbuds blocked the brain. Migi took his right arm instead. After his mother's death, Migi rebuilt his heart with 30% of his cells. Enhanced strength, speed, vision. The cost: emotional blunting, temporary inability to cry.

"I'm not sure I'm human anymore."

Specimen N°.02

Parasite Symbiote · Logical · Learned Empathy

Cold, logical, purely survival-driven—until he wasn't. Learned Japanese in a day from books. Manifests eyes, mouth, blades from Shinichi's arm. Requires 4-hour sleep cycles. Ultimately chose dormancy over violence, calling humans "wonderful" for having time to spare.

"I'm glad I failed to take over his brain."

Specimen N°.03

Student · Shinichi's Love · Never Learns

Warm, perceptive, emotionally resilient. Notices Shinichi's changes but never learns about Migi. Traumatized by Shimada's school massacre. The reminder of his humanity—the reason he keeps fighting to feel again.

"You're still you, aren't you?"

Specimen N°.04

North High · Parasite Sensing · Tragic

"Bad girl" who could sense parasite signals. Couldn't differentiate Shinichi from regular parasites. Believed they were soulmates. Practiced sensing until she emitted her own signal—fatal mistake. Killed by a parasite she mistook for him.

"I can feel you. We're connected."

◆ THE ANTAGONISTS ◆

Predators & Philosophers

The five-parasite monster. The human who hates humanity. The mother who learned to love.

Specimen N°.05

Composite · 5-in-1 · Apex Predator

Five parasites, one body. Created by Reiko Tamura's experiment. Monster form: three meters, four arms, scythed tail, digitigrade legs. Near-invincible. Withstood military assault. Destroyed by poison and Migi's return.

"I am a wild organism. I live to fight."

Specimen N°.06

Human Mayor · Sympathizer · Extremist

Human—not parasite. Believes humanity is poison to Earth. Built the parasite cabal, won the mayoral election, established safehouses. The title "Kiseijuu" is mentioned only at the end of his final speech. Killed during City Hall Massacre.

"Humans are the real parasites."

Specimen N°.07

Parasite Scientist · Maternal · Sacrifice

Cold parasite scientist who evolved beyond her nature. Mated experimentally, bore a human child, developed maternal love. Killed three parasites in 3-on-1 combat. Shot by police—sacrificed herself to save her infant. Her death triggered Shinichi's emotional recovery.

"Humans and parasites—we are the same."

Specimen N°.08

Transfer Student · Observer · Rampage

Assigned by Reiko to observe Shinichi. Enrolled at West High. Claimed peaceful intent—continued hunting humans. Exposed by Yuko Tachikawa with paint thinner. Rampaged through the school, killed 17. Killed by Shinichi on the roof. The catalyst for public parasite awareness.

"I just wanted to understand you."

Specimen N°.09

Composite · 3-of-5 · Gotou's Subordinate

Shares a body with Gotou. Can only control 3 of 5 parasites—poor coordination, falls off trucks, limbs crash. Cheerful, curious about human expressions. Decapitated by Shinichi; Gotou took over. Died in the final battle.

"You have such interesting faces."

◆ THE SUPPORTING CAST ◆

Survivors & Victims

The ones who lost, the ones who grieved, the ones who helped.

Specimen N°.10

Office Worker · Failed · Hybrid

Contemplated , fell off a cliff, got infected instead. Jaw took his jaw/neck to save him. Helped Shinichi avenge his mother. Emotional, talkative, cries easily—the opposite of Shinichi's numbness.

"I understand your burden."

Specimen N°.11

Shinichi's Mother · Deceased · Catalyst

Burned her hand saving Shinichi from boiling oil as a child. Killed by a parasite on vacation. Her body was used to attack Shinichi—stabbed through the heart. Her death triggered his transformation and emotional blunting.

"I'd like to bring Shinichi here someday."

Specimen N°.12

Student · Police Brother · Catalyst

Brother is a police sketch artist—peripherally aware of parasites. Noticed Shimada's head reformed after a baseball hit. Stalked him. Confronted him alone. Threw paint thinner into his open head cavity. Survived. Exposed parasites to Japan.

"I saw his face... change."

Specimen N°.13

North High · Kana's Ex · Grieving

Kana's ex-boyfriend. Beaten by Shimada, beaten by enhanced Shinichi. At Kana's funeral, attacked Shinichi for not crying—called him "not human." The contrast: Mitsuo grieves openly. Shinichi can't.

"You couldn't even cry for her."

Specimen N°.14

Serial Killer · Police Asset · Dark Mirror

Captured serial killer with parasite-sensing ability. Coerced into helping police identify parasites. Threatened Satomi. Dark mirror to Kana—both sense parasites, but Uragami is a murderer while Kana was innocent.

"I can smell them. Can you?"

◆ THE TEN ARCS ◆

From Infection to Dormancy

Ten arcs. Eighteen characters. One question: who is the real monster?

INFECTION · MOTHER'S DEATH · REIKO · KANA · SHIMADA · ORGANIZATION · MIKI & GOTOU · CITY HALL · FINAL BATTLE · EPILOGUE

From spore arrival to Migi's dormancy. The Infection Arc begins with earbuds blocking a brain takeover. The Mother's Death Arc transforms Shinichi into a hybrid. The Reiko Arc follows a parasite who learned to love. The Kana Arc is a tragic parallel. The Shimada Arc exposes parasites to the public. The Organization Arc reveals Hirokawa's cabal. The Miki & Gotou Arc unveils the true antagonist. The City Hall Massacre brings open warfare. The Final Battle ends with poison and sacrifice. The Epilogue brings dormancy and peace.

◆ THE ARC RECORDS ◆

Chapters of the Invasion

Spores · Earbuds · First Contact

Spores fall. A parasite tries for Shinichi's brain—earbuds block it. Migi takes his right arm instead. First kills. Establishing coexistence. The hidden predator in society revealed.

Nobuko · Fatal Stab · Cellular Rebuild

Nobuko killed on vacation. Body used to attack Shinichi. Stabbed through the heart. Migi disperses 30% of cells to rebuild him—enhanced abilities, emotional blunting. Uda and Jaw introduced. Revenge achieved.

Scientist · Maternity · Sacrifice

Cold parasite scientist evolves. Mates experimentally, bears a human child, develops maternal love. 3-on-1 battle—kills Kusano's faction. Shot by police. Mimics Nobuko's face. Sacrifices herself for her infant. Triggers Shinichi's recovery.

Soulmate Belief · False Signal · Tragic Death

Kana senses parasite signals—can't differentiate Shinichi from predators. Believes they're soulmates. Practices until she emits her own signal. Fatal mistake. Killed by a parasite she mistook for him. Dies in his arms.

Infiltration · Paint Thinner · Public Revelation

Shimada enrolls at West High. Assigned to observe Shinichi. Yuko exposes him with paint thinner. Rampage—17 killed. Killed by Shinichi on the school roof. Parasite existence becomes public. Paranoia spreads. Hair-pulling becomes normal.

Mayor · Safehouses · Internal Politics

Human mayor builds parasite cabal. Safehouses in restaurants. Political power. Internal betrayal—Kusano conspires against Reiko. 3-on-1 battle. The organization's structure, conflicts, and eventual downfall.

Composite Parasite · Truck Chase · Gotou Takes Over

Miki volunteers to hunt Shinichi. 3-of-5 parasite control—poor coordination, falls off trucks. Decapitated. Gotou takes over. First encounter in the woods—Shinichi barely survives. The true antagonist revealed.

Military Operation · Hirokawa's Death · Gotou's Rampage

Police and military launch coordinated assault. Most parasites killed. Hirokawa revealed as human—dies announcing his beliefs. Gotou slaughters soldiers, survives. Organization dissolved. Open warfare.

Poison · Migi's Return · Decapitation

Shinichi confronts Gotou with poison and a rusty rod. Hydrogen cyanide injection. Migi escapes, returns. Internal parasite rebellion. Decapitation. Destruction. Human ingenuity over biological superiority.

Dormancy · Dream Farewell · Acceptance

Migi goes dormant. Visits Shinichi in a dream—calls humans "wonderful." Shinichi's emotional recovery. Satomi becomes his lover. Reiko's child entrusted to him. Acceptance: can only protect the small family around him.

YOUR PLACE IN THE INVASION

You might arrive as a civilian with no knowledge of parasites, a student at West High before the rampage, or a parasite who successfully took over a human host. Hunt hostile parasites with Shinichi and Migi, navigate the government cover-up, join Hirokawa's cabal, or simply try to survive in a society that's learning to fear itself.

Your choices are unbound. The parasites don't care who you were before.

LOREBOOK

~39 Entries = ~25,000 Tokens

Three lorebooks: Characters (18), World Info (11), Arcs (10). Each entry is 300–600 tokens—personality, appearance, history, abilities, relationships, narrative role. Start at any arc. Setting up a scenario like an encounter, a conversation, or a hunt is enough.

The hunt begins.

⚠ CONTENT ADVISORY

This bot contains themes of gore, body horror, psychological manipulation, violence, and existential dread for the purpose of horror roleplay.

All minor characters have been aged up. Children characters are referenced only and have no applicable definitions.

A proxy is required to manage high-context RPG bots like this. Any resulting bugs or quirks pertain to low-context models cutting paths or cutting corners.