Naruto : Minato back to the past

 Somewhere in the dense forest, there was an extremely sharp and piercing sound of breaking through the air.

 This sound immediately attracted the attention of many Konoha ninjas in the valley on that side, but in the past month, everyone has become accustomed to this sound that comes several times a day.

 Ninjas who know a little about chakra sensor can detect an extremely terrifying chakra fluctuation from it.

 "Bang!"

 Suddenly, the sound of explosion was heard again where the sound came from.

 The Konoha ninjas did not find it strange.

 In the forest, Minato's body was embarrassed and crashed into a giant tree. The considerable force caused the trunk to crack slightly.

 He looked at the scarred ground within a diameter of several meters about ten meters away with fear again.

 "It's really difficult." Minato sighed from the depths of his soul.

 Upon hearing this, Minato nodded, but then smiled and said, "If an S-level jutsu can be developed so easily, wouldn't we have succeeded long ago?"

 The voice did not refute. In his previous life, Minato spent three years developing the Rasengan. Before his death, he experienced the Ninja War and then succeeded as Hokage. This series of events left him with little time to continue developing ninjutsu.

 However, he also took some time to practice, but the result was always failure.

 To develop an S-level ninjutsu, it takes at least five years of continuous study and practice.

 The time he spent developing the Rasengan is much shorter than this.

 "You have to be careful with your hands. The destructive power of this unfinished jutsu is all directed at ourselves. The wind-type chakra that is so subtle that it cannot be detected by the naked eye will destroy your chakra pathway when the ninjutsu is condensed."

 "Although your body is fused with the Nine-Tails' chakra and has amazing recovery ability, if you continue to train with such high intensity, even if you really master it within two months, your hands will not be able to condense chakra for at least one month after the success."

The current Rasengan is not yet complete, so the damage it has is limited, but when it is truly completed, the power will inevitably double, but the damage to oneself will also increase.

 Minato had never thought that the Rasengan that he continued to develop would hurt him.

 However, even so, the development of the Rasengan cannot be stopped, because he has promised Tsunade and others that he will complete this ninjutsu within two months to help Sakumo break the steel puppet of Sunae.

 "Come again!"

 So Minato dragged his body with chakra depleted and started practicing again.

 As soon as he finished speaking, the chakra in his body surged up, and soon the decadence in his blue eyes disappeared, replaced by a bright look. The chakra like blood slowly attached to Minato's body, and from time to time, chakra appeared like bubbles.

 The substantial chakra film attached to Minato's body again, and his pupils became fox eyes again.

 Minato naturally got the medicine prepared by Tsunade that could increase chakra by nearly two-fold, but he only used it a few times during his training.

 Because the original intention of obtaining this medicine was just to avoid exposing that he had the chakra of the Nine-Tails.

 And the few times he used it was just to confirm the medicinal properties of the medicine. Tsunade is worthy of being a figure who will stand at the top of medical ninjas. The medicine she prepared is effective.

 When practicing, Minato was at least one kilometer away from Konoha's station, which was to avoid the observation range of the Byakugan.

 In the past month, he has been using the Nine-Tails Chakra continuously. Gradually, the tingling sensation in his body when using this chakra gradually disappeared, and He found that the growth rate of his body's chakra increased with day-to-day use.

 Minato once placed the Eight Triagram Seal on Naruto's body in order to form a kind of fit between the long-term fusion of the two chakras, and that was something that Minato could do when he used the Shiki Fuujin.

 That is to transform the nature of his own chakra into chakra suitable for Naruto, and combine it with the Eight Triagram Seal in his body to help Naruto control the power of the Nine-Tails.

 Minato found that he also began to have this ability.

 This means that when this ability reaches a certain level, Minato can share the Nine-Tails chakra in his body with other people.

 As for the premise, it is naturally that Minato has completely mastered his own Nine-Tails Chakra, which is what "Adult Minato" said, when Minato has regained control of the Uzumaki clan's fuinjutsu.

 Buzz.

 In Minato's palm, the Rasengan appeared again, and he began to practice again.

 "Hoo, hoo!"

 Minato leaned against a tree, breathing heavily.

 Swish!

 At this moment, light footsteps were heard in the forest behind him. Minato didn't even look, because he knew who was coming.

 When the person landed on this devastated open space with agility, a trace of surprise flashed across her bright obsidian eyes, and then she looked sideways and saw Minato leaning against the tree.

 "You're here." Minato turned his head to look at Mikoto.

 Mikoto nodded slightly, then came to him, took out a package from the ninja bag behind her, and put it in Minato's hand.

 Minato naturally removed the oil paper wrapped around the outside, and the aroma immediately wafted out, which refreshed him.

 "Thank you."

 Minato looked at the roasted rabbit in front of him, thanked Mikoto, and began to eat heartily.

 "He's here again."

 While Minato was eating, the voice in his body came again, and Minato nodded without any surprise.

 At this moment, behind a tree dozens of meters away in the forest behind him, Uchiha Fugaku hid his figure and looked at Mikoto and Minato.

 "Actually, you don't have to come every day."

 After noticing Uchiha Fugaku following behind Mikoto, Minato raised his eyes and said to Mikoto.

 Mikoto heard this and chuckled: "That won't work. Before I came, Kushina specifically told me to take good care of you, otherwise, I will be miserable when I return to the village."

 "She can't do anything to you." Minato smiled, and the two of them were naturally joking.

 Mikoto's behavior towards Minato was partly due to Kushina's entrustment and partly due to the concern of her friends.

 Before Kushina entered school, the two were very good friends.

 "But...you should always pay attention to the people around you." After joking, Minato smiled at Mikoto.

 The latter was slightly stunned when she heard this, but she didn't quite understand what Minato meant.

 Minato didn't say it out loud. At Mikoto's current age, she naturally wouldn't have any ideas about matters between men and women. At most,

 she was just ignorant. But Fugaku, who followed Mikoto every day, was different. He is a few years older than Mikoto, not to mention that as the young clan leader, he is mature for his age.

 With his skills, he followed Mikoto every day, and the former couldn't detect it.

 "I'm leaving. I have a mission in the afternoon. You should also be careful when you practice."

 After staying here for a while, Mikoto left.

 When she left here, Minato smiled lightly in a certain direction of the forest.

 "Fugaku-senpai, don't worry, Mikoto and I are just good friends." Fugaku, who was about to leave a few dozen meters away, turned around when he heard this.

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