The next few weeks, Kai used this chance to familiarize himself with this new power while fighting Ria Ross.

They fought seriously, trying to win with all their might. However, Kai had his own resolve and managed to fulfill this objective. They fought ten times each day with each fight lasting thirty minutes.

In these fights, Kai and Ria learned each other's pattern to make a grand plan they could use to beat them in the next match.

Out of one hundred matches, thirty of them went to Kai while the rest went to Ria. Considering that his earlier expectation was low, Kai felt happy with his current achievement but wasn't satisfied yet.

He sought improvement. These two were coming up with their own trick, so they needed to constantly think about their fights, giving a perfect opportunity for both of them to create a battlefield situation.

After all, Kai needed to face the protectors from the sea that he had fought several times. Ria trained his adaptability and discerning ability, so Kai could understand the opponent better than ever.

She hoped with this kind of training, they would get more information and improve their strategy. For what? Kai and Ria agreed on one thing. This preparation was meant to be the pilot plan of the big war that might appear in the near future.

Not wanting to get destroyed, Kai chose this hard way even if he needed to exhaust himself. After all, if he needed to choose whether he wanted to live leisurely with the girls for the next few years but died after that or suffered during this war period to experience a long future, he would undoubtedly choose the latter.

Finally, one week before the school started again, Kai and Ria faced their 300th battle.

"This will be our last fight. I hope you have prepared all of your tricks to beat me…" She smiled.

"Of course. I will be taking you down on our last match. Even if I don't win the war, I shall win this last battle." Kai smirked.

"Hoh? Talking big, eh? Fine by me. Let me see your power then." Ria Ross waved her finger up and down, taunting him.

"As usual." Kai smiled and made a distance before tossing the coin into the air. On his hand were his Vibration Swords ready to cut her. A smile couldn't help but appear on his face as he felt this was the most meaningful training he had after a long while.

Ria was the same. Every single time she faced Kai, she felt the need to improve, not wanting to be surpassed by him this easily. As long as she maintained her strength at the top, she could give Kai a goal to chase.

After all, it was easier to chase her back rather than walking straight to his path that there was no way to tell which was right or wrong. As long as she raised the bar high enough, he should be fine. This was Ria's motivation to improve.

Looking at Kai's Vibration Swords, she took a deep breath.

"Ding!"

The moment the coin hit the ground, both jumped forward, slashing both their weapons simultaneously.

However, Ria obviously couldn't handle Kai's strength, forcing her to use both her hands to barely hold his weapon back.

"You are lucky to know the weapon stronger than my Vibration Sword. However, can you handle this one?" Kai smiled, trying to cut her with his other sword.

As he said, Ria, the creator of his Vibration Sword and the researcher of the magical beasts, had found to create this powerful sword that had the hardness of that of a Protector's skin.

When the second blade came, a magic circle appeared on their feet before five spear blades emerged from within, shooting straight to Kai's head.

Not having the option, he took a step back and used his second sword to slash those five spears.

"What did you say again?" She smirked.

"I am saying, how do you dodge this?" Kai created a small magic circle that burst out Sound Wave. It was powerful.

Ria lowered her hand just to block it. Even then, it looked hurt so much.

"That Sound Blast is really annoying!" She clicked her tongue. After this training session, Kai learned how to create a smaller Sound Blast that seemed to be harder to create since it required him to concentrate the magic.

However, this smaller Sound Blast had a power advantage over the normal Sound Blast. If one were hit by this, they would feel as if there was a blunt bullet hitting them in that specific area. The result was apparent.

It gave a quite swollen mark over that area.

"Sound Blast, Bullet Version." Kai smiled.

"By the way, I haven't asked this yet. Does it have a range limit?" She asked.

"Yes. The most I can use without losing the power inside it is around this room's size." Kai sighed. "I mean, the Sound Wave will go in all directions, so that's the only range I can control it."

"Even so, it's already powerful enough. It's as if you have a third hand holding a pistol." Ria commented while maintaining her distance.

"I agree with that, but I believe it has the potential to grow." Kai nodded, feeling fired up to improve this magic.

"I agree." Ria nodded. "Well, what I hate from you right now is your strength. You were already ridiculously strong, so that strength is making you stronger. Since we were forbidden from asking during the fight, so there was no information leak, how about we make an exception in this last fight?"

"Sure. I am curious about Teacher too." Kai nodded. "Your magic activation is significantly faster that I feel like I should improve in that area as well. This way, I won't have to worry whether to choose my Sound Blast or Oscillation Shield."

"Is that so? I have no advice for you since you can only achieve this with training."

"Yeah. Haiz, how I wish to have 48 hours a day." Kai sighed.

"Don't be. How long are you going to sleep?"

"Isn't that question for you?" Kai looked at her weirdly. She was the one with the sleeping issue due to her workaholic nature.

"Well…" She looked away before a magic circle appeared on the ground and ceiling simultaneously. Not only those two magic circles, but there were also a few white lines appearing in the room. "You shouldn't talk with your enemy, you know. This is why. You have been surrounded."

Kai only shook his head while smiling. "Who is my teacher?"

"Me—" When she answered him, she suddenly felt dizzy and her eyes were shaking. "This is…"

Not wanting to wait any longer, she leaped backward, finding that between Kai's thighs was a small Magic Circle.

Yes, he had completely understood the concentration, so he could create a small magic circle for every single of his magic.

What he used just now was the Resonant Beam that he usually used to shake their eyes, blurring their vision.

They both proved themselves as shameless fighters that used every single trick just to defeat their opponent. And both managed to surprise each other with this trick.

In the long term, Ria was the one having the advantage, but in the short term, he was. That was why he didn't waste a second and chased her, not letting her recover.

"You shameless student. Are you trying to make your teacher blind while we are talking?"

"Aren't you the one who wants to kill your student during the discussion?"

Kai and Ria snorted as the two clashed again.

Luckily, Ria felt that the shaking eyes had recovered slightly as she used a Magic Shield to block the Sound Wave from it.

This lowered her speed a bit, allowing Kai to catch up.

As soon as he entered her range, she slashed the first strike in order to stop his march.

Kai didn't think much of this single sword strike that ran through the ground. He simply used his Vibration Sword and blasted it away while making his way toward her.

Ria summoned a few white metals from the ground to support her power to clash with Kai.

It was effective for a few seconds before both of them kicked each other on the stomach.

Since he had his exoskeleton, Kai recovered faster than her and leaped forward, trying to cut her down with this opening.

Ria also realized that she couldn't swing to the front due to her momentum, so she changed her plan and swung it to the back instead, sending the Sword Strike through the wall, ceiling, and ground, arriving behind Kai.

Kai obviously understood the pattern, so he didn't look back, only using his left hand to destroy it again.

Ria suddenly smiled, making Kai nervous for a second before noticing the change on the Sword Strike's path.

He instinctively turned around and realized that it was a zig-zag instead of a straight line. When it hit his sword, he was blown away because of the sideway momentum, creating a distance to reset the fight again.

"This…" Having enough distance from Ria, Kai looked around and found that the room was filled with bending lines. Unlike her usual lines of attack, this wasn't straight but instead random. Kai wouldn't be able to figure out the patterns in a short time, and by the time he learned it, Ria would have changed the pattern into another one.

Still, what made him mad was the fact there was a loop in the room as if it was where a track went 360 degrees flip.

He shouted with an angry tone. "Did you just freaking create a roller coaster track in this place?"

"Oi, oi. You are talking to your teacher here. Language."