Five years passed by since Kyuubi attack and Kenshin who is currently 6 years old have made tremendous improvement in these five years.
Till he was 3 years old, Kenshin just trained basic version breathing technique of "Breath of the Sun" with some push ups, crunches and light stretching and didn't do any heavy physical training.
From 3rd year he started doing physical training which included long run, more sets of push ups, pull ups and other exercises. He found that breathing technique after exercise gave more benefits than just breathing.
He also focused on his chakra control. He mostly did leaf concentration and wood wall walking to the extreme. He couldn't do water walking and others as his parents forbade him to enter training field before 4 years age.
In the last two years, his father taught him some jutsus like shuriken jutsu, kunai throwing, Substitution jutsu, Transformation jutsu and Body Clone jutsu. All the things taught in the academy.
Kenshin learned all of them in 3-4 months which gave his parents a great surprise. They were happy as their child is a prodigy. He happily taught Kenshin Taijutsu as well as Body Flicker Jutsu.
He also showed his talent by learning them in few months. His parents always brag when it comes to their son, so Kenshin told them to not tell anyone about his talent as it might be dangerous.
Kenshin's parents laughed at their sons paranoia but still complied to it. Kenshin knew he can't always hide so he decided to join Anbu at 6 years age when others were going to school.
After learning Body Flicker Jutsu and Taijutsu that his father taught him, Kenshin's father gave him chakra paper to test his chakra nature as he will provide him jutsu according to it if possible.
When tested it was found that Kenshin has three chakra nature that is Fire, Lightning and Wind. Kenshin's father has Wind chakra nature so he taught him Wind release jutsu's.
His father taught him Drilling Air Bullet, Gale Palm, Great Breakthrough, Dust Cloud technique and Flashing Fireworks. Kenshin learned all of it in 8 months time.
In the meantime he didn't forget Taijutsu training as well. He often spar with his father and after every spar his father could see him improving.
Kenshin didn't forget his Kenjutsu training so from his 5th birthday when Kenshin was given a short sword as gift as per his request, he started his Kenjutsu training. His father was not proficient in it so Kenshin has to train by himself.
Kenshin then started practicing the 12 Kata's or forms of Breath of the Sun technique. In one of the spars with his father, Kenshin included one of the Kata's of his sword technique and used it in Taijutsu by using his hand as sword.
This surprised his father. Kenshin's father who has only trained in Leaf Taijutsu (Though his father has learned the basic, intermediate and advanced of it. He is very textbook type ninja) so when Kenshin used some variation his father was overwhelmed a bit but managed to defeat Kenshin.
Like this Kenshin's life went on till now. Even though Kenshin is 6 years old, he have chakra of about mid chunin level along with good mastery in Ninjutsu, Taijutsu as well as Kenjutsu.
Today Kenshin decided to go to Hokage tower and ask him to join Anbu as going to Academy will be a waste for him. So after getting up, Kenshin did his daily exercise and all. When it was 10 AM in the morning, he decided to visit Hokage tower.
Kenshin wore a black short pant and maroon colour hooded Tshirt which along with his brown hair and brown eyes looked very nice. After getting ready Kenshin went out.
"Mom, I am going out", said Kenshin.
"Where are you going?", asked Kenshin's mother.
"I am just taking a break and will be back by lunch", said Kenshin.
Kenshin didn't want to tell his parents that he will join Anbu because they will most likely will not allow him. After that Kenshin went towards Hokage tower. In the reception hall Kenshin was told by the receptionist to wait till Hokage is free.
After waiting for an hour Kenshin was guided by a ninja towards Hokage's office. After walking for a minute they reached their destination.
"Hokage sama, I have bought the kid named Kenshin who wanted to meet you", said the ninja who was bringing Kenshin.
"Send him in", said the Hokage from behind the door.
Kenshin soon went in and found that Hokage was standing near the window and puffing smoke. Kenshin looked at Hokage who looked exactly like in the anime albeit a bit younger. Similar to Kenshin the Hokage, Hiruzen was also watching the boy who looked like a 7-8 year old child.
"Greetings Hokage sama", said Kenshin
"Okay child what do you have to say. Before that can you please tell your name", said Hiruzen.
"My name is Hayate Kenshin", said Kenshin.
"Ok tell me what's the issue or what you want to talk", said Hiruzen.
"Hokage sama, I want to join Anbu ops", said Kenshin.
"Hein? Why do you want to join kid?", Hokage was surprised by Kenshin's request but was also intrigued.
"I want to be stronger and going to the Academy will not help me as I have learned all the things taught in Academy", said Kenshin.
"Then why not join the Academy and just file for early graduation. You can become genin like that", said Hiruzen.
"I don't want unwanted attraction. If I join Anbu under you then nobody will do anything underhanded", said Kenshin.
"Oh, so show me the three basic Ninjutsu that is required to pass the exam", said Hiruzen.
After that without saying anything Kenshin just performed the three jutsu's perfectly.
"Okay but joining the Anbu is dangerous, so are you up for it", said Hiruzen.
"Yes Hokage sama", said Kenshin.
"Do your parents know about this", asked Hiruzen.
"No Hokage sama. I know they will not agree to it but to become strong and to protect them in incident like Kyuubi incident. I have to be strong. For that I will join Anbu", said Kenshin.
Watching Kenshin Hiruzen thought, "This kid is another genius like Itachi"
"Okay come here tomorrow at the same time. I will take you to Anbu Headquarters where they will test you. If you succeed you will join them. Also if you succeed I will talk to your parents about it", said Hokage to Kenshin.
"Thank you Hokage sama", said Kenshin while bowing a little bit. After that Kenshin said his goodbye and went back home.
"Hayate Kenshin. Such a talent. His chakra reserves as about mid chunin level and also learned to mask it. He is a genius like Itachi and Kakashi if not more. Our village needs child like him in future", said Hiruzen while watching Kenshin through the window.
Kenshin after that didn't mediate like usual and just swing his sword while using breathing technique. He just want to be in battle mode so as to get selected in Anbu ops and make a way for future.