In a dark room where the only source of light were some torches lit in the Middle of the room. 

In the room there were 10 huge figures with different no of tails from 0 to 9 were surrounding a human figure with pale skin and white robes listening to him speak.

There was a huge seal on the floor with a magatama in front of each figure. 

The old man standing in the middle of the circle was once known as Hagoromo Otsutsuki, the sage of six paths. 

The one who sealed rabbit goddess preventing her from causing destruction of the human race and freeing them from her tranny or so what the world was told.

"My time has come, I don't have much long to live. I used my ability creation of all things to separate each one of you, though I thought there would be 9 on you" said the man looking at the a huge figure of a cute looking golden fox closed eyes and a crack in the middle of his head with a budding tail behind his back with complicated emotions in his eyes but still continuing

"Tsukimi, Shukaku, Matatabi, Isobu, Son Goku, Kokuo, Saiken, Chōmei, Gyuki, Kurama all of you are like my grandchildren, after I leave you are to keep the balance in world and have a friendly relationship with all the humans in the world.

 Your duty is to keep guarding this temple. Even if you are apart you will always be together. When you all get together again to protect the world you will understand what true power is"

Many different emotions could be seen in the eyes of these small figures from sadness, worry and care, every single one of them except the one with closed eyes. 

Kurama, the small orange nine tailed fox was the most affected even to the point releasing some tears.

" I will always be watching you from pure land. Don't fight among yourself, take care of each other" while he was speaking his figure started to get more and more transparent.

" Grandpa, don't leave us alone!, I will miss you. Big brother, you should also tell him to stay with us" Kurama said in a childish crying voice but his voice was filled with sadness and agony. 

His last sentence was directed at the figure who was sitting with his eyes closed as if whatever that was happening had nothing to do with him.

Tsukimi was called big brother by all these cute little creatures.

He took care of them from their birth and as they grew he indulged them in their talks to satisfy their curiosity. They grew close to him especially due to the special connection the nine held with him.

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All of the nine separated beasts see the man as their parent who gave life to them. 

Looking at Hagoromo who they come to see as an annoying grandfather but still the one they come to care about, they felt sadness.

Even the trouble makers like Shukaku, Son Goku, and Saiken were sad and their eyes turned moist.

Tsukimi, who had known the man since he was baby, ran around naked with maids chasing him. He was one of the few people who knows that man's darkest secrets. 

Even his brother who passed away while protecting the seal of the moon had his own shortcomings. He felt nothing about his departure.

He knew the guy had some way to stay around, he was that shrewd to let things take their course.

Kurama was the one who spent most of his time with the old man. 

Others also cared about him and were attached to him, but most of the time they ran off in the wild following their instincts. Even with his proud nature he was a good boy.

Hagoromo looked at the orange furry fox and smiled, turning his eyes to golden fox to speak " Tsukimi you are the remaining cluster of the ten tails, residue left after separation of all nine of them but still you are most intelligent of them all, if it was me 500 years ago I would have sealed you but after spending time with you I can to accept you as my grandson. 

I hope you keep yourself safe and don't lose control and get stronger."

Hagoromo used to be an ambitious man, seeking power to compete with his brother. He has done his fair share of bad things in his life.

He even sealed his own mother in the moon who was devastated by her own husband's betrayal and went mad due to consuming chakra fruit without any preparations.

Till now he feels sorrow for his mother but still does nothing to rescue her from eternal damnation.

Even with his talent in seals and knowledge he gained after many years of existence he couldn't do anything.

Tsukimi was the seed planted to destroy the planet by the Otsutsuki clan to extract its power in the form of chakra fruit and due to the contaminated source of the planet the ten tails consumed it became violent and lost to its instincts.

The name Tsukimi was given to him by Kaguya with whom he has been since he was assigned to her within the Otsutsuki clan. 

He came to his senses once his power was separated in 9 parts and the remaining power formed connecting his consciousness to it while forming a body of a cute little golden fox.

Tsukimi knew everything that had happened since his birth. He came to experience what humans are capable of at their best and lowest even to their loved one.

Tsukimi, who was addressed, did not feel anything towards the words of the dying man . He did not like nor hated the old man.

Why would he when the man is dying even though he can interfere with minor things in the world as a planetary level being but still he is dying. 

He knew the guy used his grandfather-like persona to get close to people even with him who was older than him which confused the fox.

Sometimes he says idiotic things that's the conclusion old fox came to.

'Now that i think of it, isn't there that guy in the future that acts like him, what was his name,... ah Hiruzen Sarutobi

The bijus are immortal due to them being the embodiment of chakra; they just need time and they are back to their full power. which is why the only way to deal with them is to seal them.

There may be some other way to know what will happen in the future.