Zenitsu's frozen smile vanished.
"No one can complete this kind of training! Are you trying to kill me! I haven't even gotten married yet, don't you think it's pathetic for me to die from this training now? Extremely pathetic!
It would be too pathetic to die without seeing Nezuko turn back into a human, without marrying Nezuko! Nezuko would also be widowed for life because of this! And the one who caused all of this would be you, Musashi! How can you bear it! Waaah waaah waaah..."
Zenitsu instantly pounced on Musashi, grabbing his clothes and crying out.
Tanjirou felt a bit helpless hearing Zenitsu's words, but Zenitsu had protected Nezuko many times during this Infinity Train mission, and it was the same before at the Drum Mansion, so he was still willing to acknowledge Zenitsu.
Musashi also felt a bit helpless seeing Zenitsu's appearance, and just then, Inosuke, who was beside him, was starting to give out.
The stone he was carrying was originally tied with a rope for arm strength training, and Inosuke could already pull it up relatively easily, but now it had become carrying it to do squats, and the difficulty had increased by more than a little.
After about twenty repetitions, Inosuke's legs and arms began to tremble.
"Boar Rush... Charge..."
Inosuke used his Breathing Technique, shouting slogans to encourage himself, but this could not make him break through his limit.
His arms suddenly went limp, and the huge rock was about to fall.
However, the next moment, the huge rock lifted, as Musashi stood to the side, pulling up the rope tied to the rock with one hand.
Inosuke, exhausted, immediately collapsed onto the ground.
The training I arranged for them seems to be a bit too harsh...
Inosuke's situation made Musashi realize that his arrangements were indeed a bit unreasonable.
So he thought for a moment and said to Zenitsu, "Sorry, I misjudged just now. Zenitsu, you can run three laps first, but you must maintain Total Concentration Breathing, Constant throughout."
Based on Inosuke's situation, their limit should be roughly one-tenth of his standard, so Musashi also reduced Zenitsu's training to one-tenth.
"That's still a lot, Musashi, the Demon Slayer Corps Headquarters is very big," Zenitsu said to Musashi, tears streaming down his face.
"Any less and it won't be effective," Musashi said to Zenitsu with some difficulty, feeling that guiding others in training was truly not an easy task, and he also somewhat understood why the Hashiras generally had no successors; guiding others still required experienced people.
"Alright then..." After hearing Musashi's words, Zenitsu said no more, wiped his tears, and went running with a look of heroic sacrifice.
"Sorry, I was inconsiderate. Are you alright?"
Musashi said, stepping forward and extending his hand to Inosuke, feeling a pang of guilt in his heart; if he hadn't noticed just now, Inosuke might have been injured because of his training.
Inosuke stared at Musashi's outstretched hand for a moment, then stood up on his own.
"Hmph, if you hadn't interfered, I definitely could have done two hundred," Inosuke said, though his trembling arms and legs made his words unconvincing.
"Mm, you rest for a bit first," Musashi nodded and said to Inosuke, then he looked at Tanjirou.
Tanjirou felt a bit uneasy at the moment; the training Musashi had just arranged for Inosuke and Zenitsu made him somewhat doubt Musashi's ability in that regard.
Although he hoped to train diligently and get stronger as quickly as possible, he also didn't want to undertake training that couldn't be completed.
"Tanjirou... your training is holding your breath."
Musashi said to Tanjirou, this was the training method he came up with to strengthen Tanjirou's lungs; although simple, it should be quite suitable for him.
The essence of Breathing Technique is to rapidly inhale a large amount of oxygen in a short period, thereby instantly and significantly enhancing one's physical abilities.
As long as he trains his lungs well, he will certainly be able to use Hinokami Kagura much more easily in future battles, and the power of his sword techniques will also be correspondingly improved.
"Hmm... let's start with three minutes first," Musashi thought for a moment and said, having realized from Inosuke's situation earlier that his previous training arrangements were not quite suitable, so he adjusted the planned training volume for Tanjirou based on Inosuke's situation at that time.
Tanjirou breathed a sigh of relief upon hearing Musashi's words; holding his breath for three minutes was not difficult for him.
"Okay," Tanjirou nodded in response.
Then Tanjirou prepared a wooden bucket filled with water for his breath-holding training.
The training of the three began in full swing; in addition to these exercises, Musashi also used the insight of Transparent World to improve Zenitsu's and Inosuke's sword techniques, making them more suitable for their bodies and enabling them to unleash their full strength to the maximum extent.
After realizing that his standards differed from Tanjirou and the others, Musashi's guidance ability was quite good.
Just as Musashi was guiding the three in training within the training ground, a Demon Slayer Corps member with black hair, green eyes, and thick eyebrows saw Zenitsu outside the training ground.
"Tch." Upon seeing Zenitsu, Kaigaku showed a look of disgust and was about to turn and leave, but at that moment, the conversation between two Kakushis passing by made him stop.
"Master Musashi truly cares for the lower-ranking swordsmen; even though he's so busy, he patiently guides the lower-ranking swordsmen in their training," one Kakushi said with emotion, looking at Musashi in the training ground.
"Indeed, and he is very respectful to us low-ranking Kakushis too; he's truly a gentle person," the other Kakushi echoed.
"Hey! Is the Master Musashi you're talking about that genius swordsman Musashi, who joined the Demon Slayer Corps less than half a month ago, slayed Lower Moon Two, and became a Hashira?" Kaigaku called out to the two Kakushis, asking in a condescending tone.
Kaigaku's attitude displeased the two Kakushis, but he was a Demon Slayer Corps swordsman after all, so they couldn't say much and replied, "Yes."
After hearing the Kakushi's reply, Kaigaku looked at Zenitsu, who was in the training ground, honing his sword techniques under Musashi's guidance.
Why is this guy so lucky? He gets meticulous guidance wherever he goes.
The fire of jealousy gradually ignited in his heart, Kaigaku clenched his fists, and after a moment, he snorted coldly and left.
Unbeknownst to them, it was already dusk, and Tanjirou and the other two, having trained all day, were utterly exhausted.
"Alright, that's enough training for today. We'll continue tomorrow, and I'll appropriately increase your training volume. But don't worry, I'll also consider your endurance," Musashi said with a smile, looking at the three in front of him; he was already feeling quite adept now.
"Bring it on! I will definitely complete all the training and become stronger! Hahahahaha!" Inosuke shouted with full energy, raising his arms.
"I'll do my best too!" Tanjirou also chimed in.
"I hope you really can be appropriate," Zenitsu complained to Musashi.
Then, after bidding each other farewell, Musashi parted ways with them.
...
The next day, early in the morning, as soon as Musashi stepped out, he saw a Demon Slayer Corps swordsman standing outside his courtyard, seemingly waiting for him.
"Master Sun Hashira, my name is Kaigaku, and I want to become as strong as you. I hope you can guide me!"