After arrived about ten years into the past along with Nemesis inside his body. Rito did not wasting the time he have, Rito writing all the memories of the future he have in his personal diary using a special ink made from Nemesis Dark Matter. So no one can read the content inside his diary except from him, who already become one entity with Nemesis. If other people are trying to read the content of his diary, what people see was only a boring daily life of Yuki Rito.
Nemesis also did not forget to make Rito train his body, because if Rito are using her power with his current body his body cannot withstand her power. So Nemesis make Rito body two times more dense and heavier by manipulated the molecule inside his body using Dark Matter. Rito who was ordinary in a sport are having a hard time to move with the new weight of his body to the point Mikan think Rito are sick because his body movement are look really weird.
Thankfully because Rito are a persistent person, he did not giving up easily. So after two weeks has passes, he already used to move in his new weight of his body.
Nemesis explaining to him, that she can only increases Rito body weight to six times. Because if she increases Rito weight more than six times, a lot of people would be suspicious with him. Beside Rito would destroy a chair or a bed if Nemesis try to increases Rito body weight more than six times.
***
The result of the training for many month was making Rito really strong, much more stronger than ordinary human. And one days, when Rito was doing his daily routine in hunting an illegal alien who are doing evil thing on Earth. He coincidentally meet, Kuro. The most famous assasin in the galaxy and one of the people who can fight to draw againts Gid Lucione Deviluke.
Kuro have a job from a Jurai empire to hunt down the illegal aliens that come to Earth without proper procedure. Usually the one who taking care a case like this was a GP member. But sadly Mihoshi Kuramitsu, the GP officer who have responsibility to protect Earth was an idiot to the max. That's why the first prince of Jurai, Yosho, hiring Kuro to hunt the illegal alien. Because Earth was on the protection of Jurai empire and one of their territory. Not even Gid Lucione Deviluke who rules one third of the galaxy want to challenge Jurai empire.
Because Jurai empire was the true ruler of Milky way galaxy. They have a very long lifespan, insane physical power and also the tree ship with a power that made Gid overwhelming power like a child's play.
Kuro was impress by the talent that Rito show to him, so he decided to train Rito and teaching him a lot of thing. From how to fight in close combat to how to use a gun and harness the energy inside his body. Rito absorbing all those information and teaching like a sponge and he mastering all the thing that Kuro teach to him in only three years. And now when Rito age reach the middle school age, Kuro stop teaching Rito. Because Kuro contract already done and he also finish in teaching Rito all the thing he can to teach.
***
Rito got a special gun from Kuro that can harness a life energy inside his body. As a gift that Rito already finish his traning. The gun can be change into a neckale so Rito can bring the gun anywhere. Have a Sensei that have a power on par with Gin Lucione Deviluke was a very good luck according to Nemesis. Because in the milky way Galaxy, Kuro are the most feared bounty hunter that not even Gin are dare to challenge because they are on par with each other.
And now Rito are very happy that he would meet with the love of his life Haruna Sairenji.
"Oii Onii-chan be careful in the school," Mikan said who was look more taller than before while wearing an apron because she just finish cooking. "Because sometimes you can be very clumsy!"
"Mikan you know right my clumsiness just an act to make everyone else think that I was just a normal person who cannot even hurt a fly," Rito said with a sigh. "Why you still think that I was a weak person who cannot do anything alone?"
***
"Nice try Onii-chan! But you cannot fool me with your act! Because I knew for sure that clumsiness of your are too perfect for an act!"
Mikan who was Rito adopted little sister or more correctly her younger cousin from his father younger sister are still fooled by Rito act of clumsines, because the act was too real. And Mika respond are giving Rito a headache, because he did not think that Mikan would be truly fooled by his act.
"Sigh whatever, if you believe me that was good and if did not want to believe me, that was okay too."
After saying that words Rito using teleport trick that he learn from Kuro using the raw qi inside his body to make somekind of wormhole in the air to send him self to the school. Because he already late.
When Rito are using teleport, Mikan eyes was almost getting out of it socket. Because this is the first time for her seeing Rito doing something impossible. Her older brother always told her that he can do a lot of thing that break the law physics. But Mikan choose to ot believe in Rito because she was think that Rito only want to pranking her. And now when she was seeing Rito suddenly disappear in front of her. Now she truly believe that Rito never told a lie to her.
"H-How did Onii-chan can disappear like that? Are he using a magic trick or he really can do a lot of thing that break the law of physics!?"
Author Note; Sorry for not updating this story for years because I really forget about this novel.