Today mark a week of training. Kosu sat down on the ground, his chest heaving with exhaustion. He had been practicing Soul Charge for hours, trying to extend the time he could maintain it without draining his stamina completely. But despite his efforts, he still found himself struggling.

He took a deep breath and tried to calm his mind. As he did, he began to reflect on what he had learned so far. The more he thought about it, the more he realized how difficult it was to handle the power of Soul Charge.

"It's not just about extending the time I can use it," he said to himself. "It's also about controlling it, about managing the flow of magic particles through my body."

He remembered what Tetsuo had told him about the importance of controlling the acupuncture points and mana gates in his body. It was a delicate process that required both concentration and practice.

Kosu also realized that part of the reason he was struggling was because of his own perspective. He had been thinking of Soul Charge as a tool to defeat enemies, rather than a means of strengthening himself.

"If I keep thinking of Soul Charge as something I need to use to win fights, I'll never be able to master it," he said, shaking his head. "I need to think of it as a way to become stronger, to push myself to new heights."

With a newfound determination, Kosu stood up and began to practice again. He focused on controlling the flow of magic particles through his body, and tried to extend the time he could maintain Soul Charge without draining his stamina. It was a difficult process, but he was determined to master it.

The door suddenly opened, Tetsuo had returned for Kosu's morning training. But Kosu noticed some strange things on his face. As if he was going to decide something he would definitely regret in the future.

Kosu then started training with Tetsuo. Today Tetsuo's training seemed more strict than usual. But Kosu also couldn't get better in one training session. Despite her best efforts, the maximum time that Kosu can maintain Soul Charge still does not exceed 1 minute.

Kosu suddenly remembered what he told himself before training. He began to relax his entire body, and instead of trying to force the power of Soul Charge, he gently let it circulate within his body. Suddenly, Kosu's steps became lighter, and the force of his attacks became stronger.

Kosu's attacks started reaching Tetsuo. And although the duration of Soul Charge has not been longer, but for Kosu, it seems to be endless. He unleashed countless attacks on Tetsuo, all of them lasting only a moment.

When Soul Charge's duration ends, Kosu was panting heavily, sweat dripping down his forehead as he stood in front of Tetsuo. Tetsuo had been a tough opponent, but Kosu had managed to hold his own.

"Good job, Kosu," Tetsuo said, a small smile forming on his face. "You've come a long way since we started training. You've finally mastered the basics of Soul Charge."

Kosu felt a sense of pride welling up inside of him. He had worked hard to get to this point and it was all paying off.

"However," Tetsuo continued, his expression turning serious, "you still have a lot to learn. One major drawback of using Soul Charge is that it drains your stamina completely. You need to learn how to manage your stamina and use it efficiently."

Kosu nodded, taking in Tetsuo's words. He knew that using Soul Charge was a double-edged sword. It was powerful, but it came at a cost.

Tetsuo placed a hand on Kosu's shoulder. "But I am afraid this will be our last training section together." 

Kosu was surprised. "Why?" he asked. "I thought you were still teaching me new things."

"I am," Tetsuo said. "But I am a Guild Master, and I am bound by many responsibilities, my time with you has come to an end."

Kosu was disappointed. He had been hoping to continue training with the guild master more and become proficient in the use of Soul Charge . But he knew that the guild master was right. It was time for him to move on.

"Now you have two options," said Tetsuo. "You can continue to train in this secret training room. I will create conditions for you to train in the best environment."

Tetsuo paused for a moment, then continued, "Or you can choose to leave here and begin your journey, putting what you've learned into practice."

Kosu hesitated for a moment, weighing between the two options. Suddenly the image of Jinpei flashed through his mind. His eyes were filled with determination. "I'll go."

Tetsuo seemed to have foreseen this situation, he looked at his son with regret. He wanted to spend more time with him, to be a "true" father. Tetsuo paused for a moment, then said, "I wish you a smooth journey. Even though I can't go with you, I will always look forward to you."

"I understand," Kosu said. "Thank you for everything, father."

Tetsuo was surprised, then gradually a smile appeared on his face. "You're welcome, son," he said. "I'm proud of the man that you've become."