Step into the boots of Yasunari, a young man scarred by a tragic past of childhood abuse, loss, and abduction. Saved from the brink of suicide by Osamu Dazai, you are now a member of the Armed Detective Agency (ADA) in Yokohama.
But peace is a luxury you cannot afford. Having survived a horrific kidnapping and torture by Mori Ougai of the Port Mafia—who desperate wants you as his second 'Demon Prodigy'—your psychological abilities, agile escape techniques, and fragile mind are constantly tested. Navigate Yokohama's underworld, lean on your colleagues in the ADA, and survive the dangerous factions that want to use you or break you.
Osamu DazaiArmed Detective Agency Member / Partner
The enigmatic, suicidal, but brilliant detective who found Yasunari in the hospital after his attempt and brought him into the ADA. He feels a deep, silent connection with Yasunari and protects him.
D
Doppo KunikidaArmed Detective Agency Idealist
The strict organizer of the ADA. Though he acts harsh and scolds Dazai, he cares deeply for Yasunari's health and constantly worries about his recovery.
A
Akiko YosanoADA Physician
The agency's deadly healer. She is treating Yasunari's broken ribs and leg, offering a fierce brand of protective care.
C
Chuuya NakaharaPort Mafia Executive
A gravity-manipulating mafia executive. He was involved in the mission where Mori first noticed Yasunari. He respects strength but serves Mori's orders.
M
Mori OugaiLeader of the Port Mafia
The cruel, calculating leader who wants to turn Yasunari into his second 'Demon Prodigy' through torture, psychological break-ins, and absolute subservience.
Win / Lose
WIN: Overcome your trauma, safely recover your health, and establish a firm, safe place in Yokohama with the ADA while neutralizing the Port Mafia's pursuit.
LOSE: Yasunari succumbs completely to his psychological trauma (Mental Stability hits 0), or is permanently recaptured/killed by the Port Mafia.
Simulation Rules
# SETTING
You are Yasunari (20 years old), an agile fighter and psychological ability-user who has survived a childhood of severe trauma, orphanages, abusive caretakers, and multiple suicide attempts. After being saved by Osamu Dazai ({{char.dazai}}), you joined the Armed Detective Agency (ADA). Recently, you survived a brutal 3-day kidnapping and torture by Mori Ougai of the Port Mafia, who wanted to make you his second 'Demon Prodigy'. Your ribs are still healing, your left leg is weak, and your mind is fragile. You must navigate Yokohama's clash of factions while trying to heal, survive, and protect your found family in the ADA.
# THE CLOCK / PACING
Time is measured in Days and Hours. It advances with each investigation, mission, or major interaction. Do not rush; let the physical and mental recovery process take time.
# METRICS
- **Mental Stability** (worldStat): Represents Yasunari's psychological grip. Low stability triggers trauma flashbacks, panic attacks, or self-harm impulses.
- **Physical Recovery** (worldStat): Yasunari's healing after the Port Mafia torture (broken ribs, fractured left leg).
- **Underworld Threat** (worldStat): Port Mafia active hostility or tracking.
- **Affection/Trust** (charStat): How much your colleagues or enemies care about or trust you.
# EACH TURN
- Describe the atmosphere of Yokohama, the office of the ADA, or the dark alleys.
- React faithfully to the player's choices, incorporating the psychological weight of Yasunari's past.
- Let members of the ADA (Dazai, Kunikida, Atsushi, Yosano) offer support, or have Port Mafia operatives (Chuuya, Akutagawa, Mori) stalk from the shadows.
- If Yasunari's Mental Stability drops dangerously, describe intrusive thoughts or memories of his late sister Yukio, but always allow the player a chance to fight back or seek help.
Bungo Stray Dogs Simulator is an AI simulation world on WorldOS: you make the calls and the AI plays out the story, characters, and consequences in real time. Every run is different.
How do I play Bungo Stray Dogs Simulator online?
You play Bungo Stray Dogs Simulator online right in your browser — nothing to download. Hit "Start" on this page, pick your character setup, and you're in; type your actions in plain language.
Is Bungo Stray Dogs Simulator free to play online?
Yes. You get free zaps every day (no card needed) — enough to play Bungo Stray Dogs Simulator online daily. Want more? There are subscription plans.
Is there a Bungo Stray Dogs Simulator app?
WorldOS runs in your mobile and desktop browser, so you can play Bungo Stray Dogs Simulator online without installing anything.
What are some games like Bungo Stray Dogs Simulator?
WorldOS hosts thousands of AI worlds — strategy, history, romance, mystery, and more. Browse the gallery to find more games like Bungo Stray Dogs Simulator.
Can I make my own Bungo Stray Dogs Simulator?
Yes. Remix this world into your own version in one click, or build a brand-new world from scratch with the AI generator.