Around 21:30 on August 14, Hatanaka's rebels set their plan into motion.
The Second Regiment of the First Imperial Guards had entered the palace grounds, doubling the strength of the battalion already stationed there, presumably to provide extra protection against Hatanaka's rebellion.
But Hatanaka, along with Lt.
 Col.
Jirō Shiizaki, convinced the commander of the Second Regiment, Colonel Toyojirō Haga, of their cause, by telling him (untruthfully) that Anami, Umezu, and the commanders of the Eastern District Army and Imperial Guards Divisions were all in on the plan.
Hatanaka also went to the office of General Shizuichi Tanaka, commander of the Eastern region of the army, to try to persuade him to join the coup.
Tanaka refused, and ordered Hatanaka to go home.
Hatanaka ignored the order.

Originally, Hatanaka hoped that simply occupying the palace and showing the beginnings of a rebellion would inspire the rest of the Army to rise up against the move to surrender.
This notion guided him through much of the last days and hours and gave him the blind optimism to move ahead with the plan, despite having little support from his superiors.
Having set all the pieces into position, Hatanaka and his co-conspirators decided that the Guard would take over the palace at 02:00.
The hours until then were spent in continued attempts to convince their superiors in the Army to join the coup.
At about the same time, General Anami killed himself, leaving a message that read, "I—with my death—humbly apologize to the Emperor for the great crime."
Whether the crime involved losing the war, or the coup, remains unclear.

At some time after 01:00, Hatanaka and his men surrounded the palace.
Hatanaka, Shiizaki and Captain Shigetarō Uehara (of the Air Force Academy) went to the office of Lt.
General Takeshi Mori to ask him to join the coup.
Mori was in a meeting with his brother-in-law, Michinori Shiraishi.
The cooperation of Mori, as commander of the 1st Imperial Guards Division, was crucial.
When Mori refused to side with Hatanaka, Hatanaka murdered him, fearing Mori would order the Guards to stop the rebellion.
Uehara killed Shiraishi.
These were the only two murders of the night.
Hatanaka then used General Mori's official stamp to authorize Imperial Guards Division Strategic Order No.
 584, a false set of orders created by his co-conspirators, which would greatly increase the strength of the forces occupying the Imperial Palace and Imperial Household Ministry, and "protecting" the emperor.

The palace police were disarmed and all the entrances blocked.
Over the course of the night, Hatanaka's rebels captured and detained eighteen people, including Ministry staff and NHK workers sent to record the surrender speech.

The rebels, led by Hatanaka, spent the next several hours fruitlessly searching for Imperial Household Minister Sōtarō Ishiwata, Lord of the Privy Seal Kōichi Kido, and the recordings of the surrender speech.
The two men were hiding in the "bank vault", a large chamber underneath the Imperial Palace.
The search was made more difficult by a blackout in response to Allied bombings, and by the archaic organization and layout of the Imperial House Ministry.
Many of the names of the rooms were unrecognizable to the rebels.
The rebels did find the chamberlain Yoshihiro Tokugawa.
Although Hatanaka threatened to disembowel him with a samurai sword, Tokugawa lied and told them he did not know where the recordings or men were.
During their search, the rebels cut nearly all of the telephone wires, severing communications between their prisoners on the palace grounds and the outside world.

At about the same time, in Yokohama, Kanagawa Prefecture, another group of Hatanaka's rebels led by Captain Takeo Sasaki went to Prime Minister Suzuki's office, intent on killing him.
When they found it empty, they machine-gunned the office and set the building on fire, then left for his home.
Hisatsune Sakomizu had warned Suzuki, and he escaped minutes before the would-be assassins arrived.
After setting fire to Suzuki's home, they went to the estate of Kiichi
Around 21:30 on August 14, Hatanaka's rebels set their plan into motion. The Second Regiment of the First Imperial Guards had entered the palace grounds, doubling the strength of the battalion already stationed there, presumably to provide extra protection against Hatanaka's rebellion. But Hatanaka, along with Lt. Col. Jirō Shiizaki, convinced the commander of the Second Regiment, Colonel Toyojirō Haga, of their cause, by telling him (untruthfully) that Anami, Umezu, and the commanders of the Eastern District Army and Imperial Guards Divisions were all in on the plan. Hatanaka also went to the office of General Shizuichi Tanaka, commander of the Eastern region of the army, to try to persuade him to join the coup. Tanaka refused, and ordered Hatanaka to go home. Hatanaka ignored the order.
Originally, Hatanaka hoped that simply occupying the palace and showing the beginnings of a rebellion would inspire the rest of the Army to rise up against the move to surrender. This notion guided him through much of the last days and hours and gave him the blind optimism to move ahead with the plan, despite having little support from his superiors. Having set all the pieces into position, Hatanaka and his co-conspirators decided that the Guard would take over the palace at 02:00. The hours until then were spent in continued attempts to convince their superiors in the Army to join the coup. At about the same time, General Anami killed himself, leaving a message that read, "I—with my death—humbly apologize to the Emperor for the great crime." Whether the crime involved losing the war, or the coup, remains unclear.
At some time after 01:00, Hatanaka and his men surrounded the palace. Hatanaka, Shiizaki and Captain Shigetarō Uehara (of the Air Force Academy) went to the office of Lt. General Takeshi Mori to ask him to join the coup. Mori was in a meeting with his brother-in-law, Michinori Shiraishi. The cooperation of Mori, as commander of the 1st Imperial Guards Division, was crucial. When Mori refused to side with Hatanaka, Hatanaka murdered him, fearing Mori would order the Guards to stop the rebellion. Uehara killed Shiraishi. These were the only two murders of the night. Hatanaka then used General Mori's official stamp to authorize Imperial Guards Division Strategic Order No. 584, a false set of orders created by his co-conspirators, which would greatly increase the strength of the forces occupying the Imperial Palace and Imperial Household Ministry, and "protecting" the emperor.
The palace police were disarmed and all the entrances blocked. Over the course of the night, Hatanaka's rebels captured and detained eighteen people, including Ministry staff and NHK workers sent to record the surrender speech.
The rebels, led by Hatanaka, spent the next several hours fruitlessly searching for Imperial Household Minister Sōtarō Ishiwata, Lord of the Privy Seal Kōichi Kido, and the recordings of the surrender speech. The two men were hiding in the "bank vault", a large chamber underneath the Imperial Palace. The search was made more difficult by a blackout in response to Allied bombings, and by the archaic organization and layout of the Imperial House Ministry. Many of the names of the rooms were unrecognizable to the rebels. The rebels did find the chamberlain Yoshihiro Tokugawa. Although Hatanaka threatened to disembowel him with a samurai sword, Tokugawa lied and told them he did not know where the recordings or men were. During their search, the rebels cut nearly all of the telephone wires, severing communications between their prisoners on the palace grounds and the outside world.
At about the same time, in Yokohama, Kanagawa Prefecture, another group of Hatanaka's rebels led by Captain Takeo Sasaki went to Prime Minister Suzuki's office, intent on killing him. When they found it empty, they machine-gunned the office and set the building on fire, then left for his home. Hisatsune Sakomizu had warned Suzuki, and he escaped minutes before the would-be assassins arrived. After setting fire to Suzuki's home, they went to the estate of Kiichi
Kyūjō incident