200 yrs ago in an different world same like earth called fortunately it was also called as beta earth by people who lived there in a place called hidden leaf village in an family of demon clan called Nura clan . A person named Nurarihyon who was the supreme commander of the clan and the third hokage of the village had a half son called Inu no Taisho who was a half demon, fourth hokage, and the lord of the eastern lands and was the second heir of the clan and had a human wife named Kushina. One day while Kushina was walking home after shopping before HSDW was born she was attacked by a white demon like creature called hollow bit her; wounding her and giving her some arrancar powers and while she gave birth to HSDW it was passed on to the date of 7 march they had their second son who was also a half demon was born and they named him HSDW. HSDW had a elder brother who was a full fledged demon named Sesshomaru. Sesshomaru was a wicked demon and always thought of plans how to seize the throne from his father and grandpa. Sesshomaru never treated HSDW like his younger brother and had always treated him like his enemy and wanted him out of his way for the throne of the third heir. Inu No Taisho had a very brilliantly mastered excellence and knowledge in warfare and using of weapons; he had a hobby of collecting rare and the strongest of weapons he had many rare weapons and were made by a blacksmith who was known for his excellence in making weapons and his name was Tottosai. He was very loyal to Inu No Taisho as he rescued Tottosai from a big explosion at war and helped him settle his life because he had his family killed by the opponent nation. So as Inu No Taisho had 8 great weapons named:-
1) Tessasaiga
2) Tensaiga
3) Sounga
4) Zabimaru
5) Quincy bow
6) Blazing Inferno Fang
7) Shining Thunder Fang
8) Burning Volt Fang
Nurarihyon had his favourite sword name Nenekirimaru from his human wife Yohime.(FLASHBACK). She was a very beautiful human princess she had the power of healing illness and wounds. Her father was very greedy and used her powers to gain money. But because of her powers her father did not allowed her to leave the castle because if she was died or is killed her father would not have any source of income. As Nurarihyon used to have night walk and one day he encountered the castle where Nurarihyon found a very pleasant smell that was of Yohime and she also had a weapon with her that is Nenekirimaru as it was created to protect her against evil demons. As Nurarihyon went inside to see where the sent is coming from he went inside and saw Yohime a beautiful princess. She saw her and was about to scream and suddenly, Nurarihyon covered her mouth with his hands and said " A beauty like should not be shouting so rudely; but still you look beautiful even when you are acting harsh". After feeling the warmth and the touch of her soft lips he gently removed his hand from her mouth. In confusion she drew Nenekirimaru and slashed a little wound on his left arm. Because of seeing the wound she said " OH I am so sorry please don't be angry I will heal your wound ". And started to heal his wounds . Nurarihyon was surprised to see this and said "Wow! Its so amazing that a human like you can have some powers like this.(If she could be my wife it would so good to have her as she would heal my wounds after battles). Hey beautiful can you be my lady and marry with whom I can spend my life; love her with my whole strength. I will give you some time to spend with me and have ourself enjoy our youth ". After hearing this words she was thought that better than living this life like prison she should better be leaving but nodded her head and thought her father raised her from birth and she should not leave him like this. Then Nurarihyon carried Yohime in his arms and started running through the castle but she asked Nurarihyon " Why can't the guards see us" he said because "I am the great yokai nurarihyon and mere mortals can't see me because of my fear". She smiled gently and Nurarihyon took her and went to the Nura clan resident and introduced her. And like this they daily escaped the castle and as the time they spended together they both fell in love with each other and when they married Yohime gifted Nenekirimaru to her husband Nurarihyon. And one day when Inu No Taisho got married to Kushina a demon named Lady Hagoromo Gitsune was told a rumor by a person that the one who eats the liver of Yohime would get the power of healing, wealth and great powers. Hagoromo Gitsune kidnapped Yohime at night and took her to the the castle where Hagoromo lived. As soon that Nurarihyon discovered that Yohime was missing he asked his demons and some of them told him about the rumor of eating Yohime's liver Nurarihyon took the whole demon army and became The Lord Pandemonium and took his hundred demons in the night parade of the 100 demons. And as they reached the castle he drew the sword Nenekirimaru he felt a strong presence of energy from the castle. As the light chilling winds blew towards their faces they felt their heart pounding like an earthquake occurred inside their body then they calmed their mind and marched inside the castle by breaking the entrance and as Nurarihyon found Hagoromo was already in a battle with the Fisrst and The Second hokage he jumped upwards and while flied towards Hagoromo and slashed he totally and sealed her with the help of both Hokages . Later he earned the position of The Third Hokage. (END OF FLASHBACK)
One day when HSDW was with his father at the Sacred peach tree of ages a giant 9 tailed fox demon attacked at the leaf village Inu NO Taisho fought bravely and sealed it inside HSDW. And as time was spent Inu No Taisho was attacked while he was with HSDW at the sacred peach tree of ages. Because of witnessing his father's death he ran from there and went to home and said about Inu No Taisho's death. After some days Sesshomaru took HSDW to the far away land and left him there.