At the Konoha base in the land of Grass, Yasu met Sakumo Hatake.
Sakumo quite approved of him taking Kakashi as his disciple.
Sakumo asked: "Yasu, why did you come to the Land of Grass? As far as I know, the situation in the land of Hot Water has stabilized, and here has always been like that, with no fierce battles. If you want to fight, wouldn't the battles with the Hidden Sand ninjas in the Land of River be more frequent?"
Yasu replied: "Lord Sakumo, I came here not for battle, but to find something, so for the next mission, I hope Lord Sakumo can arrange some reconnaissance missions for me and give me a certain degree of freedom."
Sakumo frowned and thought: 'Came to the land of Grass to find something?'
He thought that Yasu had received some secret mission, so he didn't ask any more questions.
Sakumo asked: "Then how much freedom do you need?"
Yasu thought for a while and said: "I hope that after I scout out the hidden rock ninjas and determine their numbers, I can attack independently, so that I can also teach Kakashi through actual combat."
Sakumo directly agreed: "If it's just this request, I can still agree to it, but I also want to remind you, Yasu, never be reckless. If you encounter a team of more than four people, retreat immediately. The battle time should not be too long; in case the enemy's reinforcements arrive."
"The Hidden Rock ninjas are very cunning and cautious. They generally don't fight outnumbered. If they encounter a powerful ninja, they will also retreat decisively and then get support from nearby rock ninjas to form a situation of more fighting less.
Because of the cunning and caution of the hidden rock ninjas, their base in the land of Grass is impregnable. There are many rock ninjas, so be careful."
Yasu solemnly replied: "Lord Sakumo, please rest assured, I will not put myself and Kakashi in danger."
Sakumo nodded: "Then next, I will issue a long-term mission for you and Kakashi. The Hidden Rock has many hidden bases in here, and these hidden bases are very threatening to future battles. Because as long as these hidden bases are there, rock ninjas' reinforcements will always be one step faster than us."
"So, you and Kakashi will investigate the hidden rock ninja bases in the land of Grass and report them to me. You can decide for yourself when to depart for the mission."
Yasu bowed: "Yes, thank you, Lord Sakumo!"
Yasu and Kakashi then left Hatake's place.
Kakashi still remembered what his teacher had said before, that when they arrived in the land of Grass, he would teach him that magical Total Concentration Breathing.
So Kakashi eagerly asked Yasu to teach him the breathing technique.
Yasu looked at the eager Kakashi and a subtle smile appeared on his face: "Kakashi, your mask should be quite breathable, right?"
Kakashi was a little puzzled as to why he asked this, and replied: "Yes, it's quite breathable."
Half an hour later.
"Teacher Yasu, I can't breathe!"
Yasu had stuffed several layers of cloth into Kakashi's mask, and the breathability could be said to be terrible.
Now Kakashi was struggling just to breathe normally, as if someone was choking his neck.
Yasu's smile was a little mischievous: "You can't stand it already? Then you're in for a lot of suffering later. Next, you have to wear this mask all the time. You can't take it off unless I tell you to."
Kakashi was stunned: "Huh? Do I have to wear it even when I sleep?"
Yasu explained to him: "Of course. Didn't I introduce the breathing technique to you before? It requires you to absorb a lot of oxygen into your blood in a short period of time to improve your body's functions."
"At your current level, you are far from being able to absorb enough oxygen to improve your body's functions, so the first step is to exercise your cardiopulmonary strength. But you still have rest time..."
Kakashi's eyes lit up and he looked at him expectantly.
Yasu said with a smile: "You can still take it off for a while when you eat and drink."
Kakashi was immediately discouraged: "What? What kind of rest time is that?"
Yasu rubbed Kakashi's head: "Okay, I'll let you adapt today, and then start the reconnaissance mission tomorrow. Don't think about taking off the mask when I'm not around. If I find out, you're in trouble."
Kakashi couldn't help but shudder when he heard his words.
Kakashi immediately assured: "Teacher Yasu, don't worry, I will definitely not take it off!"
"Okay, then go do whatever you need to do."
Yasu turned to leave but a ninja came to him, saying he was sent by Sakumo to arrange a room for him.
After the ninja took Yasu to a room, he asked: "Do you have a map of the land of Grass?"
"Yes, here."
The ninja took out a map of the land of Grass from his ninja pouch and handed it to Yasu.
"Thank you."
Yasu took the map, turned and entered the room, and closed the door.
The ninja stood at the door of Yasu's room, his mouth slightly open, his mind a little confused.
What's going on!?
He didn't say that he would give the map to him, but just let him take a look.
Taking his belonging like this, this is blunt robbery.
The ninja left depressed. He was too embarrassed to ask Yasu to return the map.
It's just a map; he can just get another one.
Back in the room, Yasu carefully looked at the map.
According to his previous guess, Karin's mother had not yet joined the Hidden Grass Village, but should be living somewhere close to it.
The hidden Grass Village is quite small, but it is still difficult to find someone in its surroundings.
But excluding some places can narrow down a large part of the range.
First of all, naturally, the hidden Grass village itself must be excluded.
After that, the Konoha and Rock ninja bases are excluded, then the range is much smaller.
However, he was not sure whether Karin's mother was living in seclusion or living with other people, so finding her next was a big project.
Yasu began to mark on the map, crossing out some places where it was unlikely she would be.
The next day.
After he finished washing up, he prepared to leave with Kakashi to carry out the mission while searching for Karin's mother.
As soon as he opened the door, his eyes stopped when he looked at the ground.
Kakashi was lying on the ground, his forehead covered in cold sweat, and his complexion was very pale.
It was obvious that it was caused by lack of oxygen.
Kakashi weakly said: "Teacher Yasu, I'm so dizzy right now, I don't have any strength in my body, and I really can't breathe. Can I take it off for a while?"
Yasu squatted in front of Kakashi and said in the gentlest tone the coldest words: "No, you have to overcome your current state, instead of waiting for it to overcome you, so there's no discussion. We're going to carry out the mission right away. Stand up and come with me."
Kakashi rolled his eyes, constantly muttering in his heart that his teacher was a demon. He was already in this state; didn't he have any shred of pity?
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