"Hmm, looks like you have finished today's training."

After James' death, his body is slowly degenerating and dissolved into blue light pieces scattered through the air. At the same time, Rein has come by Yuuji side while absorbing the pieces into his palm resulted to a beautiful blue light orb.

"more or less. Still, no matter how many times i see it, that power of resurrecting him can only be said as amazing. I wish i had that kind of power during my military days."

"haha, well it can't be used easily. There are too many conditions that need to be fulfilled. moreover, it's not like i can use this power repeatedly in battle."

The action that Rein did just now is gathering and arranging James' scattered soul into one for 'repairing' it into top shape again. in a sense, it can be described as resurrection just like Yuuji said. However,

the time and energy used for the resurrection took a huge toll on the user. even if the user is able to use this power on the battlefield, the fate of the user will definitely be dead sooner or later as the process cant' be disturbed, take a huge amount of time and many others.If an enemy has that much time, the user will be dead even before starting the process itself. Therefore, it wasn't suited to be used in the battle. Although, Rein won't deny that this power is definitely a life-saver for people who faced death on daily basis, such as Yuuji who was a soldier and mercenary in the past.

"Well, enough about my power. How is the progress of his training? is it going well?"

"Shouldn't you know the result? you are always looking at him without missing a single time."

"Even so, I want to know from the view of instructor itself. It's not like I can measure his ability accurately rather than you who teach it directly."

True, although Rein himself doesn't have any sarcastic or condemning thoughts toward James, he really can't access James' ability accurately. Due to having formidable power the moment he was born, he doesn't know the standard of normal human's capability. Moreover, he himself never had or necessity to have figures that guide him as he was a monster who reached the pinnacle by only relying on his unfathomable talent and instinct.

Therefore, Kazami Yuuji who was human who train from zero and an instructor itself can definitely assess James' result hundred times better.

"Hmmm....."

after thinking and arranging his word for a while, Yuuji gives an unexpected surprise to Rein.

"If we are going at this pace, he can definitely be the strongest existence in just 24 days."

"..... What?"

He didn't see that coming at all.There are two reasons for it. The first is Yuuji's assessment of James' skill. Even though James has connected and inherited Rein's unlimited potential to his soul, that doesn't mean his instinct, talent, experience, and capabilities are also shared. Therefore, Rein is absolutely dumbfounded that James's own potential is this high.

"If he completes my training without a problem, no existence or power excluding the magical ones can't surpass him."

"....That is seriously amazing."

To be accurate, Yuuji didn't say James will become the strongest 'human' but the pinnacle of the world itself. Although Rein itself doesn't realize the how impeccable is that, at least he knows what it means to be strongest itself.

After all, Rein himself is also one of the existence who competes for the glory of strongest itself.

"then, what's the second reason? No matter how I think about it, it's too fast."

Yes, that is the part where Rein is most surprised. Not only James can grow extraordinarily, he can accomplish it in just a few months only. From Rein's estimation, no matter how fast James' training is, at least it could take 2 years. After all, he was just a normal writer who has no skill regarding to fighting.

If so, what is the reason?

"You really don't know? it looks like you are quite shaken or you just pretend to be blind." (Yuuji)

"..... What do you mean?"

"Heh" with a smirk, Yuuji said the second reason straight to Rein's face.

"His determination."

"......"

"Even though you can't assess his skill, at least you can feel that right? In this traini- no, for the entire time no matter how much he complains, curses, tired and pained he never stops even once. Moreover, the more he experiences hardship, his determination is also growing stronger."

Yes, that is the biggest reason, at the same time the miscalculation of Rein. Even though James is an ordinary human, he has a tendency to accomplish what he vowed on no matter who cruel or difficult it is. In short, he's a very stubborn person who have a mind that is even harder than diamond.

Moreover,

"In the past, Do you know what he says to me?"

"... What is it?" (Rein)

"he says, "Since my other self has created this opportunity by sacrificing everything, I can't stop now. I have to be faster so I can fulfill his wish and relieve his worries." (Yuuji)

"..... Is that so." (Rein)

"it's an extraordinary feat. No, it can be said as a miracle itself. An urban person who didn't have a speck of fighting abilities can become the top of the world in a short period only due to a verbal promise with someone who can't even accomplish his task." (Yuuji)

That's why,

"You are hesitating right?" (Yuuji)

" ... ku!?"(Rein)

yes, that is why. In order to accomplish his goal and unfinished business, Rein needed to do the worst thing he can possibly do in his entire life just for his selfish desire.

"Since this is the opportunity, I will say the word that I hold back from the beginning. You are one of the worst human garbage I ever saw in my life."

The supreme, Rein is planning to use James to become his vessel and absorb his soul.