Chapter 7: Upgrade! Skill LV2

"Just like during the day, although intermittent use is not a problem, each instance of Full Concentration Breathing still only lasts a moment."

"The Thunderclap Flash seems to be an ability that increases leg explosiveness in an instant. It can be used not only for shooting but also for breakthrough runs. When combined with Full Concentration Breathing, it can have a very exaggerated effect. It affects both legs, although the soreness is less than that of shooting. However, it can only be used at critical moments."

"Even if I'm not in a state of Full Concentration Breathing, this skill still has a fairly wide range of applications. In the short term, I should find it difficult to maintain the use of the breathing technique for a long time, so I must fully integrate the fundamental skills..."

Kira Ryosuke wiped the sweat from his forehead. Although the soreness hadn't completely dissipated, he didn't dislike this feeling.

The proficiency of Full Concentration Breathing was gradually improving.

...

In the following days, Kira Ryosuke would go to the field to train before the sun rose.

Due to the commotion caused on the first day, he didn't use Thunderclap Flash in a state of Full Concentration Breathing on the field again. Instead, he practiced the technique in a normal state.

Furthermore, one crucial point was that a match lasted more than ninety minutes. Kira Ryosuke knew the limits of his abilities at the moment. Even if he was praised as a genius or a treasure, it was far from enough. Full Concentration Breathing could temporarily enhance his physical capabilities, but the time he could maintain Full Concentration Breathing during a match was limited. Moreover, once he used Thunderclap Flash in this state, he couldn't use the technique again for a short period. Therefore, the "basic version" of Thunderclap Flash became even more important.

Kira Ryosuke needed to practice the accuracy of shooting with Thunderclap Flash, as well as his speed with the ball.

And at this time every day, Aida Riko would also come to the gym for morning training. This was Kira Ryosuke's exclusive skill practice time, and she wouldn't disturb him. At most, she would join him in some warm-up exercises.

However, sometimes, while Aida Riko was doing her morning training, she couldn't help but get lost watching Kira Ryosuke practice. The skills and speed he displayed were beyond her imagination.

Of course, she had to admit that Kira Ryosuke had a very handsome face.

After the sun had fully risen, more people started coming to the gym. Aida Riko then took Kira Ryosuke to the fitness room for the most important physical training. Kira Ryosuke spent almost the entire day there, even having his lunch and dinner in the gym.

In the evening, Kira Ryosuke continued practicing the breathing technique. He would go jogging outside, adjusting his breathing and trying to incorporate the explosiveness of Thunderclap Flash into his running.

He even bought a gourd like the characters in the original Demon Slayer manga and blew air into it every day to train his lung capacity.

Unbeknownst to him, a week had quietly passed.

Time flew by, and it was soon the last day before reporting to the Football Association.

It was now evening, and Kira Ryosuke had just finished his final day of physical training. He rinsed off the sweat in the gym's shower room.

Feeling the gentle water flow washing away today's fatigue and sweat, Kira Ryosuke opened his system interface.

[Competitive: Thunder Breathing - Full Concentration LV1, Proficiency 100%, Upgradable, 50 Competitive Points]

[Competitive: Thunder Breathing First Form - Thunderclap Flash LV1, Proficiency 100%, Upgradable: 50 Competitive Points]

[Current Competitive Points: 80]

After this period of training, Kira Ryosuke had finally maxed out the proficiency of Full Concentration Breathing and Thunderclap Flash. He had been practicing shooting over a thousand times every morning and had consistently trained in the breathing technique at night.

Although seven days is not a long time, Kira Ryosuke can indeed feel his visible progress during this period.

In terms of physical fitness, Kira Ryosuke has made significant improvements compared to himself a week ago. The efficiency of improvement has exceeded his expectations. This is not only due to the derivative effects of practicing the breathing technique but also the result of the specially customized intensive training by Aida Riko. Additionally, balanced meals every day have ensured the efficiency of his workouts.

During this period, the practice of lung capacity and breathing techniques has gradually improved Kira Ryosuke's mastery of Full Concentration Breathing. Although he can still only maintain it for two to three seconds at a time and can only use it intermittently, the intervals between uses have also shortened.

Not only that, with the improvement of physical fitness and the increasing proficiency of the breathing technique, Kira Ryosuke's negative reaction when using Thunderclap Flash in the state of Full Concentration Breathing has also diminished. Moreover, his left-footed shooting skills have become more proficient, and he can use Thunderclap Flash to shoot with a high level of accuracy, which was something the original owner of his body couldn't achieve.

Kira Ryosuke brings his thoughts back to reality and refocuses his attention on these two skills, contemplating which one he should prioritize upgrading now.

"If I upgrade Full Concentration Breathing, I should be able to prolong the duration of each time I enter the state of Full Concentration Breathing, allowing me to use the breathing technique more frequently. If I upgrade Thunderclap Flash, it should enhance the skill's power and reduce its side effects... From the current perspective, upgrading Full Concentration Breathing should be more important. It can improve my physical abilities, increase the efficiency of my training, and tomorrow, I'll only be entering the Blue Lock. There's still time for physical conditioning and adaptation. There's a three-day gap until the first official football match."

With these thoughts in mind, Kira Ryosuke makes his decision.

[Upgrade successful! Competitive: Thunder Breathing - Full Concentration LV2, Proficiency reset.]

[Competitive: Thunder Breathing - Full Concentration LV2, Proficiency: 0%]

[Current Competitive Points: 30]

A system prompt flashes before Kira Ryosuke's eyes, and he can feel an invisible force surging into his body.

After the upgrade, the proficiency of the skill is reset, and he needs to practice it again.

However, Kira Ryosuke is aware that it will require more effort and time to fill the proficiency gauge again. The competitive points needed to reach higher levels will also increase.

He closes his eyes, adjusts his breathing, and feels the difference between LV2 Full Concentration Breathing and the previous level.

He clearly feels oxygen rushing into his lungs, converting into strength in his body.

After a while, Kira Ryosuke opens his eyes and returns to his normal breathing state.

"The duration of each time has increased significantly, from two to three seconds to over ten seconds. The intervals between uses also seem to have shortened. I should be able to use it more frequently in a match."

Although it's just a few seconds of extension, the increase in explosive power is crucial. For someone running at high speed, even a second can make a significant difference in distance.