[2] Nanba's attempt was motivated partly by his leftist ideology, and also by a strong desire to avenge the death of Shūsui Kōtoku, who had been executed for his alleged role in the High Treason Incident of 1910.

He also wanted to avenge the killings of thousands of Koreans and Japanese leftists in the Kantō Massacre.

Although Nanba claimed that he was rational (a view agreed upon in the court records), he was proclaimed insane to the public, sentenced to death on 13 November 1924, and executed two days later.

[3] Prime Minister Yamamoto Gonnohyōe took responsibility for the lapse in security and resigned along with his cabinet and a number of other high officials.

[2] He was replaced by the even more conservative Kiyoura Keigo and a cabinet made up entirely of members of the House of Peers not associated with any political party.