Selfless Or Crazy?!

The scroll in Yotazu's hand was quite worn down with several empty columns on the paper. Only one of the columns had a name and a fingerprint of one hand there, but the name was worn down to the point where Haku couldn't read it properly.

"Child, Write your name and put the fingerprints of your finger using your blood in there. Also remember, the hand that has your fingerprint is the one that can be used for the jutsu."

Haku nodded as he bit his left hand's thumb and dipped his right hand's index finger to write his name on the contract. He then smeared each finger of his right hand with blood and left the fingerprint below his name.

He had finally signed the Yeti contract!

"Yetimaru, take Haku and your kids outside and explain to him about the contract!" Yotazu ordered Yetimaru as he nodded.

"Wait! Can you teach me sage mode!" Hearing that, Yotazu narrowed his eyes.

"As we owe your first clan leader a favor, we will teach you." Haku's excitement plummeted immediately after hearing the next sentence."But you aren't strong enough to learn it, you have to fulfill some requirements first."

"Requirements? What kind of requirements?"

"The first one is that you have to have enough chakra. And another one is that you should be strong enough. We don't want a weak human to show our sage mode after all and also we don't want you to die while learning it, like your clan leader did."

"That's understandable but how much chakra is enough chakra? Also how strong is strong enough?" Haku inquired.

"You will obviously summon us in your battles, we are always analyzing. Well, Yetimaru is analyzing. You all can go out now"

Hau sighed. "Alright. Just tell me when I qualify for it."

Yotazu nodded.

After that, the larger of Yetimaru's sons approached Haku.

"Yo! Human. You can summon me anytime you need me to fight! You probably won't be able to summon Father for a while!"

"Oh, I will. What's your name?" Haku asked.

"I am Yami! I like fighting, I have the heads of a few hundred snow leopards in my mountain!"

Haku Made a thumbs-up gesture. "You are gonna have some human skull mixed in soon too!"

Yami laughed. "Now that's what I would like to hear from our contractor! Oh, and that is my younger brother Yuta. Talk with him!"

Yuta waved at Haku. "Hi Haku! I am Yuta and I like flying, that's the one thing I am better than my brother at! So you can summon me whenever you want to escape or need a reverse summon!"

The group had already reached outside and then Yetimaru turned towards Haku and said," You wanted the books of your clan leader right? It's in my residence! Hop on one of my children."

Haku looked at Yuta, "Let's practice flying with me, Yuta!"

Yuta nodded."Alright. Sit on my shoulders, Haku! Make sure you don't fall off!"

"Okay!" Haku sat on Yuta's shoulder and the group started flying at high speeds.

The fastest one was Yetimaru followed by Yuta with Yami at last Haku could see that Yetimaru was holding back. 

"You are quite fast, Yuta." Haku smiled as he looked at the mountains below.

"Didn't I tell you? I am gonna be faster than my father when I grow up!"

"Oh by the way, what's your age."

"29"

"..."

***

The four reached a mountain and entered a lit-up cave with windows in it. 

"This is my residence, child. Do you see that small chest? That has all the book your clan leader was carrying at the time of his death. But first I need to tell you something."

"What is it?" Haku looked at Yetimaru.

Yetimaru frowned, looking a bit angry. "If during battle it is sure that my children will die if you summon them, then don't summon them unless you want a reverse summoning. And even when summoning for a reverse summoning make sure they don't die in one hit or get seriously Injured. You understand?"

Haku widened his eyes as he comforted Yetimaru, "ok ok. I understand!"

Yetimaru smiled comfortably. "Good. You can take the books with you and cancel the summoning now. Also, be sure not to try to summon me for now, it will consume most of your chakra, rendering you useless for battle."

Haku nodded and walked towards the small and dusty chest. Inside it, he saw a bag. Opening the bag, he found three notebooks

One of them had the title "Diary" and the other two were named "Clan's Bloodline Evolution Volume I" and "Clan's Bloodline Evolution Volume II"

'Hmm, evolution? Is that the thing he was crazily talking about in the last 5 years of his life?'

"Bye Yetimaru, Yuta, Yami. I am gonna cancel the summoning now!" Haku said his goodbyes as he disappeared in a cloud of smoke.

***

Back on the island, Haku reappeared with three books in his hands.

'I guess I will continue with my plans after I finish reading these.'

Haku went inside the main building and towards the basement. He sat down on a carpeted floor and started reading the diary first.

The dairy started when the clan leader was 13 and it was just him realizing that his clan was crazy and happy that he accidentally managed to regain his sanity.

For a few years, it was all about getting stronger and experimenting for the cure. At the age of 20 when he was at Jonin level, he made the cure. After helping the members regain their sanity, he made a few friends and let them manage the clan.

He, on the other hand, went on a journey in the current land of fire in the warring states era. He made a few friends and a few enemies too. One of his notable friends was from the Uzumaki clan and helped him learn fuinjutsu and gave seals to him. 

Haku guessed that those were the seals used to make the basement he was in.

But, he witnessed something when he was 25. He witnessed Uchiha Madara controlling the Kyuubi encased in a Susanoo and Hashirama fighting Madara.

He understood true strength that day. He was jealous. Despite him also having a Kekkei Genkai like them, he probably could never hope to reach the same level as them.

Unless he could replicate what the Uchiha do. The Uchiha, according to the clan leader, evolved their dojutsu by using emotions and chakra as a catalyst and they even achieved a stronger version of it. The clan leader had managed to glimpse at the version.

He began to research all about Madara and Hashirama and then he came to know about the sage mode. He signed a contract with the Yeti and even helped them evolve their species in just two years.

After that the diary had only one page it had a peculiar thing written in it.

'I have managed to evolve it by a little bit, half of my hair is white. A successful result will probably turn it all white. Maybe I should learn sage mode? Yes. I will do that. This much evolution is enough! No more experimenting on myself.'

Haku was shocked!

All this time he thought that the guy was experimenting on his clan members but he never expected that guy to experiment on himself. 

What should Haku call that? Selfless or Crazy?!