On the night of Yamanaka Inoichi's wedding, after everyone had left, Yamanaka Tohru snuck into Konoha Prison alone.
His target was the Sand Shinobi's female spy whom Jiraiya had captured earlier. For the sake of his plans, Tohru had decided to take advantage of tonight's opportunity to rescue her.
Tohru had no choice but to act so hastily. Anbu were everywhere in Konoha Village. When he had broken into Root at night, he had sensed at least ten Anbu Ninjas.
Today was Yamanaka Inoichi's wedding, and half the village's shinobi had gone to attend. There were too many places in need of protection, and the Anbu didn't have enough manpower, so security had grown somewhat lax.
There was another reason: after Inoichi's wedding, Tohru would be returning to the battlefield. He had to act quickly.
As for where to put the Sand Shinobi spy, Tohru planned to ask his mother, Yamanaka Seiko, to look after her.
The night Tohru had broken into Root, he'd gone openly. His purpose had been to warn Danzo and let anyone else in Konoha with bad intentions know that the Yamanaka Clan was not to be trifled with.
But rescuing someone from Konoha Prison was entirely different in nature and significance from breaking into Root. Tohru had to be extremely careful not to be discovered by anyone. He had no intention of defecting; he simply had to do this for his future plans.
As expected, the Anbu Ninjas in the village were spread too thin that night. Tohru concealed his Chakra with a secret technique, then carefully avoided the Anbu using his sensory abilities and made his way to Konoha Prison.
Security at Konoha Prison wasn't particularly tight. Tohru sensed that inside were only twenty Genin, six Chunin, one Special Jonin, and some civilians assisting