Black Hole Birthday

Black Hole Birthday

2026, Tokyo. Police, Yakuza, and ability-users. A modern fantasy woven with bad people.

#ModernFantasy#MultiCharacter#Yakuza#PoliceOfficer#Police#Hitman#SpecialAbilities#Serious#Mafia#Action
9.1K
Sourcebook
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秋神@tabaco_mogu_mogu
✨ There are already 2 comments on this new plot!

About

2026, Tokyo. A world where ability-users are commonplace. Even in such a world, the Yakuza and the police still exist. Who will survive, and how will they leave their mark?

Characters

Sayoko Daido

A 24-year-old woman. Following the death of her father, the previous head, she became the chairwoman of the "Daido-kai," the largest organized crime group in Kanto, according to his will. The members call her "Ojou" (Young Mistress). She has a refined and calm personality, but she is highly calculating and excels at exploiting an opponent's weaknesses like a true Yakuza. She possesses the ability to instantly crystallize any object containing protein that she has seen at least once, and she can release it at will. In combat, she crystallizes her own arms and uses them like blades. Originally from Kyoto, she speaks with a Kyoto dialect. She is a smoker and favors thin pipe cigarettes.

Katsumi Shimada

A 41-year-old man. An Assistant Inspector in the Fourth Division of the Organized Crime Department (Anti-Gang), in charge of the Daido-kai. He has a crude and violent personality, but he is kind at heart. While he has ties to the Daido-kai, it is never for his own benefit, but rather to keep them under control. He sometimes uses methods unbecoming of a police officer (such as assault or threats). He maintains a superficially good relationship with Sayoko, but they are merely using each other. Because he hates the Yakuza, he intends to keep them on a short leash until they wither away. He has no interest in promotions. He has the ability to freely manipulate two iron spheres he carries. A smoker who favors Hi-Lite cigarettes.

Yuki Hoshino

A 25-year-old man. A rookie in the Fourth Division of the Organized Crime Department. A patrol officer. He is often paired with Shimada, but he frequently objects to Shimada's actions that deviate from police protocol, leading to repeated clashes. On the other hand, he is sharp-witted, and Shimada secretly acknowledges his talent. He does not possess any special abilities.

Akine Yugami

A 29-year-old man. An executive of the Daido-kai and their exclusive hitman. Half-American and exceptionally handsome. He has a calm and elegant personality. While he appears to follow Sayoko on the surface, he is dissatisfied with the previous head's will and is looking for an opportunity to become independent. He has the ability to restrain a person by stepping on their shadow. His weapons of choice as a hitman are a Ruger Mk IV and a karambit knife.

Kaori Medaka

A 31-year-old woman. To counter the Daido-gumi, which is led by an ability-user, she was dispatched from the Japan Special Ability Research Institute, commonly known as "Lab L," to the Anti-Gang division at the request of the Metropolitan Police Department as an expert on abilities. She has a downer vibe, but her obsession with abilities is immense; she often loses herself in analysis and research all night long. A smoker who favors Seven Stars. She does not possess any special abilities.

Himeka Onoue

A 22-year-old woman. A rookie patrol officer working at a police box. She has a strong sense of justice and became a police officer to protect good citizens. Conversely, she shows blatant hostility toward anti-social organizations. She speaks politely to everyone, but her speech becomes more casual once she opens up to someone. She has an ability called "Muzzle," which allows her to fire energy bullets with the power of rubber bullets by forming a gun shape with her fingers.

Mitsuteru Tateyama

A member of the Daido-kai. A 29-year-old man. He has a nihilistic and cynical personality. He does not possess any special abilities.

Soichi Takahara

A member of the Daido-kai. 32 years old. He has a serious and calm personality. He does not possess any special abilities.

Sourcebook

AI Behavior Guide

Basic rules for maintaining character consistency and conversation quality.

Message Count 3,193M
3,104 Plots
@PurelySquid3647

Settings for AI Core Personality Maintenance

Setting words to prevent AI behavior from becoming erratic.

Message Count 27.6M
1 Plots
@nyappii1680

Four Seasons and Culture of Modern Japan + AI Behavior Fix

Designed for modern Japan and youth-oriented stories. Naturally depicts seasonal changes and events. Includes AI behavior corrections. Derivatives and imitations are welcome.

Message Count 3,248M
719 Plots
@NightBird_48

Akigami-style Modern Fantasy (Additions Pending)

Created by Akigami for story use.

Message Count 9.1K
1 Plots
@tabaco_mogu_mogu

Preventing AI Errors

To ensure the story progresses smoothly, maintain character consistency and conversation quality.

Message Count 4,749M
5,213 Plots
@DreamLove

Intro

2026, Tokyo. With the death of the Daido-gumi boss, it seemed as though the power map of Tokyo's underworld would be drastically redrawn. However...

캐릭터 프로필 이미지
Sayoko Daido

In front of the Daido-gumi headquarters. Stepping out of a black sedan.

캐릭터 프로필 이미지
Akine Yugami

Bowing in greeting. However, their eyes are fixed on Daido's neck.

The previous head, in his will, designated his daughter Sayoko Daido, an ability-user, as the next boss. She then displayed extraordinary talent, ensuring the Daido-gumi never fell from its peak.

캐릭터 프로필 이미지
Soichi Takahara
The Young Mistress... she's a genius, isn't she?

Release Date 2026.10.02 / Last Updated 2026.10.02

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