Ōtsutsuki Yato (大筒木 夜ト) is the Ancestor of the Ōtsutsuki Clan and Husband of Ōtsutsuki Kaguya along being the Father of Ōtsutsuki Hagoromo and Hamura, who was born over Three Millennium years ago, during an Era of Endless Wars between Humans and Demons. After becoming the Jūbi, he was both feared and wanted as the Enemy of the World and Ancient Weapon among the worldwide Zenkai.
Ten Millennium years ago, beyond the high skies in a unknown dimension stood an impressive titanic mountain with a vast landmass, named Mount Meru. One day during the full moon, a shining white sphere began to descent slowly to a remote island, called the Great Eternal Island.
As the shining sphere was getting near to the ground, it's soft shine began to disappear, until it landed directly inside a very clear fountain. After a nearly blinding flare, the light began to change into a child, who has shoulder-length spiky white hair with many bangs covering his forehead. His attire consisted only by black colored pants. His most eye-catching physical characteristics are however his red eyes, that has horizontal white crescents around oval shaped white pupils. Around his eyes are red markings that is turned up at the corners.
This young child was no other than Yato, who was known as the God of Moon, Chandra.
As a result of coming down from the moon and being born in Fountain of Youth, not only was Chandra a True Immortal but he was a Hitorigami as well, a God who comes into being all alone without any blood-related parents nor siblings, therefore he was a very lonely God, who dreamed of family and wanted friends that would save him from his solitude.
When Chandra was 5 years old, he found a toddler crying in his Great Forest, that was around his Birthplace. Although the toddler was one the Asuras, as he couldn't bear the toddlers crying, Chandra decided to take and raise Ashura, as he named him, as his own little brother.
Five years later, while the brothers were eating breakfast in their charming tree house, a God Young-ling in the same age as Chandra, dared to enter to the Great Forest, where many sapient beasts lived. Right after the intruder set their foot to the giant forest, Chandra sensed him immediately, and as a means to interfere the Guardian Beasts, Chandra went with Ashura to meet the Intruder with curiosity. As they encountered him, Chandra decided that the intruder was not an enemy and ordered the surrounding wild beasts to leave, so that all three them could speak peacefully.
While they were speaking, the two brothers learnt that this boy in front them, was the Heir to the throne of the Devas, named Indra.
After their talk ended, Ashura learned that he was the Heir of the Asuras and that a very terrible demise had befell to his former family.
As Chandra expected for a long time, Ashura had been indeed abandoned for his own safety by his mother, as their tribe had been attacked by the Devas.
According to Indra, his own father was the one who ordered and led the raid against Ashura´s former tribe to kill him and his family. After Indra revealed the truth, he pleaded Ashura´s forgiveness in shame and regret, as he couldn't stop his father from doing something like this.
Being the sensor he was, Chandra knew Indra was telling the truth. But before he could say anything, Ashura told to the older boy that it wasn't his fault.
By sheer relief, Indra literally jumped from his seat on the ground and hugged Ashura while thanking him over again.
Time continued to pass and in a short amount of time, Chandra, Indra and Ashura began to see each other as brothers.
To seal their very treasured bond, all three of them exchanged some of their blood by the self-inflicted cut on their palms through three-way handshake. In time, the very Legend of Blood Bonding Ritual came true and they become blood-related brothers.
Even then, knowing his family won't approve their bond, Indra kept everything about Chandra and Ashura a secret.
Years passed and the three brothers continued to grow older while sparring against each other and having fun.
After a long time, while Indra was leaving his home in secret to meet his real family, his father, the King Indra, was wondering even more where his son was going.
After deciding to follow the 12 years old Indra and arriving where his son went of every time, King Indra couldn't believe that his son was meeting with the spawn of his bitter enemy, the already dead King Ashura. Overcame by rage, he attacked the three God Young-lings.
Even being caught off guard, Chandra and Indra began to fight against King Indra to protect Ashura, as the King was going after Ashura mostly.
Although they were doing their best, it was very obvious that the three God Young-lings was being overwhelmed.
Whether it was a misstep or not, Indra was thrown to the ground with a very badly bleeding gash on his chest. Albeit he wanted to help, Chandra too was thrown to a tree.
Seeing the two brats being incapable of standing again for now, King Indra began to advance towards the surprisingly impressive boy, who was barely standing. Even he didn't want to, Ashura began to step away from the true beast backwards in fear. Knowing his father would really kill his brother, Indra tried to stand up, but the only thing he managed to do was to fall on his chest.
At the same time as King Indra rose his arm to attack, after sensing it, subsequently overpowered by rage, Chandra entered the very first time into his War God Mode (Zangyaku Ran-Shin Mōdo).
Right before King Indra could deliver a lethal wound to badly wounded Ashura, without wasting any time Chandra punched King Indra from behind.
After the released shockwave slammed unto him slightly, Indra saw Chandra's right fist going through his bastard of father's chest, right where his heart should be. While he was gaping, Indra noticed that the dying God was beginning to fall on his youngest brother. Since Chandra's fist was out, Indra kicked his father away from Ashura. After managing to kick the body away, Indra fell on his knees.
Seeing Indra was wounded worse than Ashura, with the reassurance from the latter, Chandra began to heal his 3 days older brother. After healing Indra with his Infinite Healing Water, Chandra healed Ashura as well.
After checking them twice and turning his head towards the dead King, Chandra saw King Indra's soft smile before his Vessel disappeared.
Long after the whole ordeal, with the searches of the Devas for their King getting annoying to Chandra, he decided that his brothers should let themselves known as the new Kings of their kind.
After being convinced by their middle brother with a promise, 130 years old Ashura and 180 years old Indra left their true home to their Kingdoms.
Because their kind was bitter enemies, without any other choices left, Ashura and Indra would battle against each other whenever they came in contact.
Agni, the younger brother of the former King Indra, as a means to find his dear elder brother's killer had gone rogue. After two years of search without a success, Agni returned to the Kingdom without being noticed.
By having a hunch, Agni sneaked inside the current King Indra´s room. After searching around, he found in a scroll written that the killer was Chandra, the God of Moon. Even wishing to have his vengeance, he knew well enough that he couldn´t kill someone who murdered his brother by normal means. After learning that Indra was related with the Killer and the Demon, he began to plot revenge plans against the three of them.
During a battle between Indra and Ashura, without being noticed, Agni trapped Ashura in a Fire Illusion that first showed him; his tribe´s massacre and then his elder brothers losing in a fight against the Former King of the Devas.
Wanting to help his elder brothers, Ashura began to attack the former King, without knowing that he was in truth, attacking Indra with the intent to kill.
As it was getting out of hand, at the same time as seeing a lethal attack coming towards Indra from Ashura, Chandra sprang before Indra and took the blow to himself.
Right afterwards, with some spilled drops of Kokketsu dispelling the illusion he was put in, Ashura saw to his utter horror, his hand being trough Chandra's chest. Regardless of trying to pull his hand out, his forearm was roughly grabbed by Chandra with a vise grip. Even then, he fell to the ground when Chandra's hands suddenly slid down and his unconscious body slumped on him.
Since the attack was full of Anti-Holy Energy, Chandra could have died, if Indra didn't snapped Ashura out of his shock and transported Chandra together with Ashura to the Fountain of Life.
Right after getting to the fountain side, Indra forced Chandra to drink handful of water with Ashura spraying some of the water over and over again at the wound, until not even a scar was left.
Even then, Ashura couldn't stop his crying, as he was still in shock and in the clutches of fear.
Before his feelings could get even darker, he was snapped completely from his trance by the hand on his check, that belonged to awakened Chandra, who was leaning to Indra's chest.
As he saw his elder brother awake, Ashura thrown himself to the open arms of Chandra and Indra with teared eyes, while apologizing to both of them again and again.
Some times later, after Chandra was at full health, the three brothers hunted Agni and ended his suffering.
Years upon years had passed and the war between the Devas and the Asuras began to lessen greatly.
1020 years old Chandra and Indra along 1015 years old Ashura, after seeing the great opportunity, created an Alliance between each other.
After many hardships, peace among the heaven-realm Mount Meru was created. As an award to their hard work, the three brothers rose to the Living Legends Status, with Indra being called the Azure Sky, Chandra the Silver Moon and Ashura the Golden Sun.
Hundred years had passed and the times began to get even more peaceful.
However, despite the harmony between the Devas and Asuras, Chandra was getting even more distressed by the passing years, as his young adult form didn't even change just slightly, when he is already considered to be very old by many gods.
With him being unable to age physically like the other Gods, Chandra began to fear that he would outlive his most precious beings, his brothers.
Although he was wallowing in misery, Yato decided to attend the celebration meant for his aging elder brother, Indra.
While he was away from his brothers, Chandra heard from somebody saying to another person that he was just only a lucky fraud who is unable age. Even knowing that person being severely drunk, it still hurt him. Being unable to take it anymore, Chandra left the party and gone to his real home. Driven with fear, in secret Chandra drank a third portion of the Youth of Life, in hopes that the third would neutralize his Immortality.
Regrettably he couldn't never knew that the third wouldn't only neutralize his Immortality, but also effect him as a lethal poison, that began to kill him from the inside.
His Brothers being closer to him more than the other Gods, both of them had noticed Chandra's discomfort by the passing years as they got more older.
As Chandra was gone for a long time, both Indra and Ashura got even more nervous since the time they sensed their middle brother leaving the party.
While they were talking about each other about this, both of them heard the alarmed voices of the now united gods. As they glanced to the direction where the panicked Gods were looking at, Indra and Ashura noticed right away that the Full Moon was shrinking and getting darker.
Knowing full well that the Moon was tied to Chandra in spiritual way, Indra and Ashura with many other Gods began to search Chandra in panic.
Since they knew that Chandra would go to the Great Forest whenever he was feeling down or being stressed, Indra and Ashura began to run in light speed towards the Great Eternal Island, where the Great Forest is located.
When they got closer to Chandra, to their slowly overwhelming despair, they found him collapsed on his knees, coughing a lot of blood while clutching his chest in pain with hands full of his black blood, Kokketsu. Seeing the stage Chandra was in, Indra and Ashura immediately rushed to him.
Unfortunately both of them were to late.
While being held close delicately by Indra, after barely apologizing in frustration and saying his farewell whilst crying, Chandra passed away in his brothers arms with a soft smile. As he won't in the end, outlive them.
As his Vessel (Physical Body) began to disappear, so did the Moon that was linked to his Soul Energy.
After seeing the Moon's disappearance, the Gods worried for the worst and most of them, wich were Sensors, went where Indra and Ashura was, while the others went to the residing place of the Supreme Gods.
With them being the Supreme Gods; Vishnu, Shiva and Shakti noticed the Moon´s full disappearance immediately and went to the location where they lastly sensed Chandra's life force.
After arriving and questioning the mourning brothers, the three of them learnt that Chandra really passed away.
As a means to fulfill Indra's and Ashura's plea about their now dead brother, after gathering Chandra´s spread out Energy/Soul into a sphere of white pure light, the three Supreme Gods transported themselves away with the Sphere of Energy/Soul to a newly created Heaven Realm, Takamagahara.