the Bushido code, the concept of a blade used against oneself is most often associated with seppuku (also known as hara-kiri). [1, 2, 3]

• Historical Context: Seppuku was a ritual form of suicide practiced by the samurai class. It was traditionally used as a means to restore honor to oneself or one’s family, or to avoid falling into the hands of an enemy after a defeat in battle. [1, 2, 3]
• Cultural Significance: The practice was deeply rooted in the samurai’s code of ethics, representing a final act of discipline and devotion to duty. It was viewed as a way to prove one’s sincerity and courage.
• The Kaishakunin: In many formalized versions of the ritual, a second individual known as a kaishakuninwas present. This person was typically a skilled swordsman whose role was to ensure the practitioner did not undergo prolonged suffering, reflecting the structured and somber nature of the event.

For more information on the history and cultural significance of this practice, the following resource is available: Seppuku on Britannica. [1]