Mirai was currently being trained in offense, defense, and control. The techniques could be adapted flexibly during use, but raising their proficiency required a great deal of time.
During his exchange with Uchiha Itachi in the second endurance trial, Mirai's patience and aptitude for illusions improved greatly. Itachi had an especially profound understanding of genjutsu and gave Mirai plenty of guidance, greatly increasing Mirai's proficiency with the Naraku technique.
After making his plan, Mirai devoted himself wholeheartedly to understanding the techniques.
Of course, Mirai would not be practicing ninja techniques hand-in-hand this time. Instead, he constantly observed them. His first choice was Naraku, the technique he was most proficient with. Mirai continued absorbing the experience Uchiha Itachi had taught him and personally put it into practice. In just two days, he raised Naraku's proficiency to 100%.
After that, Mirai immediately began practicing "Earth Style: Earth Dragon Spear." He had chosen the Earth Dragon Spear because its proficiency increased quickly. The second reason was that Mirai had seen this Earth Style technique during the preliminary matches. Not only was it deadly, but its attack angles were extremely tricky and difficult to guard against.
Mirai poured all his energy into the Earth Dragon Spear and progressed rapidly. Whenever he encountered a problem, he sought advice from Sarutobi Hiruzen. Hiruzen's guidance helped Mirai tremendously. In only seven days, Mirai completed his training in the Earth Dragon Spear.
Once its proficiency reached 100%, the Earth Dragon Spear technique could create nine sharp stone spears to attack the enemy. Not only were they fast, but they were also silent when deployed. However, Mirai was not satisfied with the hardness and sharpness of the stone spears. He needed to work harder to alter the nature of the earth.
After Mirai completed his Earth Dragon Spear training,