The incident included a failed assassination attempt on the shogun, and resulted in many deaths and injuries of unrelated participants.

The brothers then slashed countless other samurai to the point that the number of victims is said to be unknown in Soga Monogatari.

[2] The younger brother Tokimune hated priesthood and escaped from Hakone, relying on his uncle by marriage, Hōjō Tokimasa, whose late wife was the daughter of Sukechika.

[2] On June 28, 1193, Soga Sukenari and Tokimune entered the Kamino Inn in Fujino (present-day Kamiide, Fujinomiya, Shizuoka Prefecture) and killed Kudō Suketsune.

Secretary of the Right Division of Bureau of Horses (Uma-no-jō) Tairago Yahei, Aikō Saburō, Kitsukō Kojirō, Katō Ta, Unno Kotarō, Okabe Yasaburō, Hara Saburō, Horifuji Ta, and Usuki Hachirō were wounded in battle.

The shogun drew his sword, but was stopped by Lieutenant of the Left Division of Inner Palace Guards (Sakon no shōgen) Yoshinao.

[4] The next day, Tokimune was questioned about the motives of the nightly attack in front of a large audience of the shogun's gokenin.

Lord Hōjō, Governor of Izu, Vice Governor of Kazusa, Lord Ema, former Governor of Bungo (Moro Takamitsu), Satomi Kanja, Miura Suke, Hatakeyama Jirō, Lieutenant of the Left Division of Outer Palace Guards Sawara Jūrō, Izawa Gorō, Ogasawara Jirō, Lieutenant of the Left Division of Outer Palace Guards Oyama, Lord of the Manor Shimokōbe, Inage Saburō, Naganuma Gorō, Hangaya Shirō, Chiba Tarō, Utsunomiya Yasaburō, Yuki Shichirō, Lieutenant of the Left Division of Inner Palace Guards Ōtomo, Lieutenant of the Left Division of Outer Palace Guards Wada, Kajiwara Heiza, Kano Suke, and Shingai Arajirō were present, among many other gokenin to the point that "there were too many to count."

Kano Suke and Shingai began the questioning and Tokimune gave a detailed explanation about the revenge and its motives.

After the questioning, at first Yoritomo proposed to pardon Tokimune for his bravery, but he was executed on the same day at the request of Suketsune's son Inubōmaru.

The young men of Soga have killed the enemy of their father, Kudō Saemon-no-jō, at a shogun's mansion, and now present themselves.

Tokimune did not believe they could escape to the mountains and said that he does not want to bring shame and punishment to his family by going into hiding at their parents' house.

He suggested that they kill samurai from all across the country, display the dead bodies at the shogun's mansion, and leave their names in history.

[5] After deciding to conduct a massacre, the Soga brothers fought ten samurai, Tairago Yahei, Aikō Saburō, Okabe Gorō, Hara Saburō, Gosho no Kuroyago, Unno Kotarō Yukiuji, Katō Tarō, Funakoshitō no Kitsukō Kojirō, Uda Gorō, and Usuki Hachirō at the Ide Mansion.

Hatakeyama Shigetada sent his subordinate Hangiwa no Rokurō to Wada Yoshimori to inform him that this incident was a revenge against Kudō Suketsune and was not important to the shogun.

Next, Gosho no Kuroyago attacked, but Sukenari blew at him forcing him to retreat and wounded him in the neck cutting the hair on his temple.

[5] After defeating ten samurai, the brothers entered the panicking crowd, cutting down so many that the number of victims is unknown.

[5] Nitta Shirō Tadatsune joined the fight late and criticized the poor strategy of the samurai against just two enemies.

Although Sukenari managed to cut Tadatsune's forearm and the hair on his temple, he was getting tired and his bloody sword slipped from his hand, forcing him to retreat.

Hara Saburō tried to join but was cut in the side, after which Koshibagaki no Kage almost hit Sukenari's elbow causing him to lose control.

Gorōmaru, a young man famed for his "superhuman strength" and a Yoritomo's favorite, was disguised as a woman to ambush Tokimune.

Finally, Kako Tarō and Miumaya no Koheiji arrived at the scene and the three grabbed Tokimune by the feet, arms, and bun, dragging him outside.

When Yoritomo asked why the brothers had chosen this occasion, Tokimune explained how they had been keeping a watch on Suketsune for years, but he had always been surrounded by 50 to 100 cavalrymen.

Suketsune's nine-year-old son Inubō arrived at the scene and began beating Tokimune with a hand fan.

[2][7] Hiroyuki Miura advocated the Hōjō Tokimasa Mastermind Theory in the Taishō era, which has had a great influence on the academia ever since.

[8][9][10] In Azuma Kagami and Soga Monogatari, after killing Suketsune, Tokimune also attempted to attack shogun Minamoto no Yoritomo, which is interpreted as a result of Tokimasa's secret maneuvers.

[16][17] From the issue relating the samurai of the Hitachi Province that fled without defending Yoritomo during this incident, and the fact that Take Yoshimoto of the Hitachi Province unfurled the standard of revolt shortly after the incident, there is a theory that this deepened Minamoto no Yoritomo's suspicion towards his general, Minamoto no Noriyori.

[18] On the other hand, in the Soga Monogatari, Yoritomo is continuously portrayed as being hostile towards the brothers, and he is seen ordering severe measures to be taken already before the revenge takes place;[19] however, Yoritomo underwent a major change during his interrogation of Tokimune after the revenge, ultimately praising Tokimune,[20][19] although this did not change his death penalty.

[21] The descriptions of the revenge have many points in common between Azuma Kagami and Soga Monogatari, but there are also many obvious differences.

Furthermore, the Azuma Kagami records the names of the gokenin present at Tokimune's interrogation, whereas the Manabon Soga Monogatari does not.