However, Kira allegedly continued to treat Asano harshly because he was upset that the latter had not emulated his companion. Finally, Kira insulted Asano, calling him a country boor with no manners, and Asano could restrain himself no longer.
At the Matsu no Oroka, the main grand corridor that interconnects the Shiro-shoin (白書院) and the Ōhiroma of the Honmaru Goten (本丸御殿) residence, Asano lost his temper and attacked Kira with a dagger, wounding him in the face with his first strike; his second missed and hit a pillar. Guards then quickly separated them.
Kira’s wound was hardly serious, but the attack on a shogunate official within the boundaries of the shōgun’s residence was considered a grave offence. Any kind of violence, even the drawing of a katana, was completely forbidden in Edo Castle.
The daimyō of Ako had removed his dagger from its scabbard within Edo Castle, and for that offence, he was ordered to kill himself by seppuku. Asano’s goods and lands were to be confiscated after his death, his family was to be ruined, and his retainers were to be made rōnin (leaderless).
This news was carried to Ōishi Kuranosuke Yoshio, Asano’s principal counsellor, who took command and moved the Asano family away before complying with bakufu orders to surrender the castle to the agents of the government.
To be continued.