Revenge Is Also a Crime — Kenka Ryōseibai and Katakiuchi (aka Adauchi)
2026-07-31
There is an old Japanese expression, kenka ryōseibai (喧嘩両成敗), meaning that both parties in a fight may be punished. 
Kenichi Uchikura
Founder & CEO
Pacific Software Publishing, Inc. (PSPINC)
ken.uchikura@pspinc.com
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ABOUT THIS BLOG
Kenichi Uchikura is a Japanese-American entrepreneur and founder of PSPINC. Through this blog, he shares stories and insights about Japanese history, culture, traditions, business, technology, and everyday life. His goal is to help readers better understand Japan, its people, and the values that continue to shape Japanese society today.
ABOUT PSPINC
PSPINC (Pacific Software Publishing, Inc.), headquartered in Bellevue, Washington, was founded in 1987 and has been providing internet technology services since 1997. PSPINC offers web hosting, email hosting, software development, IT support, cloud solutions, and digital marketing services. The company operates infrastructure in the United States and Japan and supports businesses worldwide with reliable technology and bilingual service.
For Service & Inquiries
Call: 1-800-232-3989 or 425-957-0808
Email: info@pspinc.com
Web: www.pspinc.com
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Revenge Is Also a Crime — Kenka Ryōseibai and Katakiuchi (aka Adauchi)
There is an old Japanese expression, kenka ryōseibai (喧嘩両成敗), meaning that both parties in a fight may be punished.
In medieval Japan, personal disputes could grow into conflicts between families and clans. One attack led to revenge, which led to another retaliation. Kenka ryōseibai developed partly to stop this cycle.
The principle was not necessarily that both sides were equally wrong. Even if someone else started the conflict, taking revenge into your own hands could make you responsible for your own actions.
But Japan also had katakiuchi (仇討ち)—revenge killing. Isn't that a contradiction?
Not necessarily.
Especially during the Edo period, katakiuchi was not simply permission to kill someone because you wanted revenge. Vendettas were subject to rules and, in recognized cases, were reported to or sanctioned by authorities. Revenge was being brought under social and governmental control.
The famous Forty-Seven Rōnin illustrates the complexity. Their revenge for their lord became celebrated as an example of loyalty, yet the shogunate still ordered them to die by seppuku because their actions violated the established order.
The lesson remains relevant today.
Someone doing wrong to you does not automatically give you the right to do wrong in return.
There is a difference between justice and revenge.
Perhaps the real wisdom behind kenka ryōseibai is not that both sides are always equally guilty. It is that individuals cannot simply appoint themselves judge, jury, and executioner.
Kenichi Uchikura
Founder & CEO
Pacific Software Publishing, Inc. (PSPINC)
ken.uchikura@pspinc.com
X (Twitter) |
Facebook |
..-・**・-....-・・-..__..-・・-....-・**・-..
ABOUT THIS BLOG
Kenichi Uchikura is a Japanese-American entrepreneur and founder of PSPINC. Through this blog, he shares stories and insights about Japanese history, culture, traditions, business, technology, and everyday life. His goal is to help readers better understand Japan, its people, and the values that continue to shape Japanese society today.
ABOUT PSPINC
PSPINC (Pacific Software Publishing, Inc.), headquartered in Bellevue, Washington, was founded in 1987 and has been providing internet technology services since 1997. PSPINC offers web hosting, email hosting, software development, IT support, cloud solutions, and digital marketing services. The company operates infrastructure in the United States and Japan and supports businesses worldwide with reliable technology and bilingual service.
For Service & Inquiries
Call: 1-800-232-3989 or 425-957-0808
Email: info@pspinc.com
Web: www.pspinc.com
..-・**・-....-・・-..__..-・・-....-・**・-..