While Minister of Foreign Affairs, Shigenobu Osumi was attacked by a bomb on October 18, 1889 by Tsuneyoshi Kurushima, a member of the nationalist organization Genyosha, and although he survived, his right leg was amputated in the lower third of the thigh.

　　Shigenobu Osumi, the founder of Waseda University, was attacked by Tsuneyoshi Kurushima, a member of the nationalist organization Genyosha, with a bomb on October 18, 1889 while he was Minister of Foreign Affairs, and although he survived, his right leg was amputated in the lower third of the thigh. Tsuneki Kurushima committed suicide by cutting himself at the scene after sniping Shigenobu Osumi. The right lower leg taken out of the alcohol soak was photographed, courtesy of the Red Cross. On October 18, while on his way back to the Ministry of Foreign Affairs from the Cabinet, Tsuneyoshi Kurushima threw an exploding bullet at the gate of the Ministry of Foreign Affairs, wounding his left leg and forcing him to amputate it. In December, Aritomo Yamagata's cabinet was formed. The activities of right-wing nationalist groups began to be seen frequently. The activities of right-wing nationalist groups began to be seen more frequently, and those that still had a flavor of the liberal civil rights movement rapidly became more nationalist, Japanist, and aggressionist. The Genyosha was the first right-wing organization founded in Japan.　

　In July 1886, due to fierce public opposition, Foreign Minister Kaoru Inoue's proposal to revise the treaty was cancelled, and Kaoru Inoue resigned to be replaced by Prime Minister Hirobumi Ito. First, he obtained the consent of the United States. During this period, the Daidan Unity Movement, led by Shojiro Goto, was active in advocating hard-line diplomacy. In February 1889, Goto joined the Kiyotaka Kuroda Cabinet (formed in April 1988) as minister of communications, a move that stunned the public. Shigenobu Osumi proposed to revise the unequal treaties that Japan had signed during the Edo period, which provided foreigners with consular jurisdiction to be tried by foreign consuls in their countries of residence. The Times, a British magazine, published the Osumi Amendment on April 19, 1889, which would have appointed foreign judges to the Supreme Court of Japan. The revision of the treaty was difficult.

　Shigenobu Okuma's proposed amendment was exposed in the "London Times" on April 19, 1889. The provisions for foreigners to reside in Japan and the appointment of foreign judges, among other things, stirred the people of Asano to a sudden boil, and a campaign against the amendment began to take place. In August, conservative groups such as the Kumamoto Kokugen Party and the Fukuoka Genyosha held a nationwide non-treaty gathering. The meeting was held in front of the Emperor Meiji on October 15. On October 18, the cabinet meeting decided to cancel the meeting.

　The amputation of Shigenobu Osumi's right leg was immediately performed on the sofa at the Ministry of Foreign Affairs by the naval surgeon Kanehiro Takagi, and then by Isamu Sato, chief of the Red Cross Hospital, and others, with the assistance of Dr. Bertsch. After the amputation surgery, Osumi's leg was immersed in alcohol in a large glass bottle. The doctor ordered him to deliver it to the Okuma residence in Waseda, Tokyo. Okuma was not a heavy drinker by nature, but the amputated leg, which was his alter ego, required alcohol at the rate of 6.70 yen per month. The accountant of the feudal lord's life was completely fed up. The leg, which had consumed alcohol, was taken to the Red Cross Central Hospital as a reference item. The leg was placed in the hospital's "open room," an eerie room.