Shie Hassaikai

Shie Hassaikai (死穢八斎會) also known as the Eight Precepts of Death is a Yakuza Organization founded and lead by Overhaul.

History
The Eight Precepts of Death is a criminal organization founded by Kai Chisaki. Chisaki was raised by a Yakuza boss who believed that gangsters would only follow a boss with a code and morals. The boss's generation ran the criminal underworld until the rise of All Might and Heroes. Chisaki feels he needs to restore the Yakuza to their former glory because he owes the boss a great debt.

Chisaki developed a plan to use the Boss's daughter Eri to create a drug that could destroy people's Quirks. Eri possessed a Quirk that could rewind people far enough back genetically that their Quirks would disappear. Chisaki would use his own Quirk to infuse her DNA with drugs that could erase Quirks.

Chisaki believed they could cull the Heroes by developing Quirk erasing bullets and distributing throughout Japan. This would bring guns back to prominence as a legitimate threat to people. Then the Yakuza would sell a cure to the Heroes after the plan gets in motion. By controlling an entirely new market for Quirks, Chisaki could reinstate the Yakuza as the biggest Superpower in Japan. He would achieve his goal of getting rid of Quirks and returning the world to the way it was before.

This Boss would not consent to Chiksaki's plan. He did not like how Chisaki planned on abusing Eri or how lowly he thinks of humans. The Boss didn't Chisaki involved with drugs and asked him to leave the Yakuza if he refuses to embrace their code of ethics.

Once the boss fell ill, Chisaki took over the Yakuza group as Captain and took on villain names. The small-time Yakuza group soon became a powerful villain organization. Some of the older Yakuza members believe Chisaki is involved in the Boss's illness. Chisaki went ahead with his plan despite the Boss's wishes but still did so with the intention of repaying his debts.

Kai Chisaki took on the name Overhaul and began recruiting members to his cause. He allowed anyone, even those who were considered trash, to join his group as long as they used their Quirk for his ambitions. Overhaul first shared his goals with Joi Irinaka and Hari Kurono, the only two people he grows to trust. Following the fall of All For One, Overhaul believes it's the perfect time to enlist himself as the new lord of darkness.

Internship Arc
The Yakuza are still a small organization on the brink of extinction and do not have ample resources for Overhaul to carry out his plan. The Shie Hassaikai need to collect funds for their operation. They commit a series of unresolved crimes where they escape with the stolen money, including one incident where Overhaul attacks Team Reservoir Dogs. The Yakuza keep their hands clean by using Overhaul's Quirk to heal the people they attack.

The Shie Hassaikai also supply Trigger (a Quirk enhancing drug) to dealers around Japan as a means for income. Overhaul is eventually contacted by Twice and recruited to the League of Villains. Overhaul agrees to meet with the League so he can recruit them to work under him instead. This enrages Big Sis Magne and she attacks Overhaul.

Chisaki is forced to defend himself and uses his Quirk to brutally murder Magne. Compress tries to capture Overhaul, but his reinforcements on standby shoot him with one of the Quirk-erasing bullets. At this stage, the bullets are incomplete and Quirks eventually return. This opening gave Overhaul enough time to blow Compress's arm clean off his body.

Overhaul tries to defuse the situation and tells Tomura Shigaraki to contact him once things have cooled off. The Yakuza continue accumulating funds and Tomura eventually meets with Overhaul again. Overhaul agrees to share the details of his plan and gets Twice and Himiko Toga as temporary Yakuza members in return.

Trivia

 * In Buddhism, the Eight Precepts are set of strict moral guidelines to be followed by the most serious of adherents. Kai Chisaki can be seen as the "Bhudda" in this situation. His followers act according to his will and model themselves after him, even wearing the masks like him.

Each of the eight expendables can in some way be related to a Precept through their Quirk or their personality.


 * 1. Kendo Rappa - Avoid killing, directly or indirectly. (Kendo's bloodthirsty nature and excitement for fights is in direct conflict with this precept.)
 * 2. Toya Setsuno - Avoid stealing and taking things without the permission of their owner. (Setsuno's Quirk allows him to steal things from opponents.)
 * 3. Yu Hojo - Avoid wearing jewelry, perfume, and make-up. Avoid singing, dancing or playing music with attachment. (Hojo's Quirk can be related to jewelry.)
 * 4. Soramitsu Tabe - Avoid eating more than one meal that day. (Tabe's Quirk allows him to eat and digest almost anything.)
 * 5. Hekiji Tengai - which forbids taking shelter and resting under a luxurious canopy.(Hekiji's Quirk allows him to to make a shelter to protect himself.)
 * 6. Rikiya Katsukame - Avoid sexual contact. (Rikiya's Quirk saps life force through physical contact and his main opponents are Ryukyu's all-female team.)
 * 7. Shin Nemoto - Avoid lying and deceiving others. (Nemoto's Quirk disallows others from violating this precept.)
 * 8. Deidoro Sakaki - Avoid toxicants: alcohol, tobacco and drugs, except for medical purposes. (Deidoro's Quirk causes others to enter a state similar to intoxication. Sakaki is also an alcoholic.)

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