At the peak of Mount Embar the Ikigaya Clan was holding the birthday party for 8th birthday for their prodigy son Akira.

*Happy B'day Onii-sama ' shouted the little sister Haruno Ikigaya while clinging to her brother's arm.

Both of you are all lovey-dovey in the party 'commented their cousin Ibuki 

C'mon she's my little sister and don't start going on making people couples 'said Akira feeling disgusted.

Yea yea we have to listen to Akira afterall this celebration is today for your birthday 'commented Ibuki.

Don't try to make fun of onii-sam afterall he is better than you ,no he is better than everyone in this world 'boasted Haruno.

A young boy a little older than Akira arrived there and wished birthday to Akira in a clumsy voice .

You also look beautiful Haruna -sama 'praised the boy. 

Who are you again ? 'questioned Haruna.

Haruna it's rude to say something like this to someone who greeted you kindly 'scolded Akira .

No it's fine if Haruna -sama don't remember me 'said the boy politely.

Let me introduce myself ,my name Ryu Ito from the side branch family of Ikiga- 

Oh! You are from the side branch family 'interrupted Ibuki. 

Ah.. Yes 'answered Ryu.

After wishing to Akira and greeting everyone the boy left to greet the family elders.

After that loud footsteps were heard  and all the people became attentive as there was standing an old woman emitting a large domineering aura on the people present there ,that was the head of the Ikigaya family Makiko Ikigaya.

I welcome you all to the 8th birthday of our future head of the family Akira , bless him with ur best wishes 'said the family head to the guests.

You are going to be the Throne King for sure my son 'whispered Akira's mother , Kimi Ikigaya patting her son's head . 

Sure, I promise I will be the king okaa-san 'exclaimed Akira with pride.

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Well with further ado let's the celebration begin 'proclaimed Makiko.

All the guests were busy wishing Akira and presenting the gifts, suddenly the fire alarm went on and guests were scared of the unexpected events.

Go and check out what happened 'ordered Makiko.

After sometime the alarms went off and all the people were relieved. Suddenly the glass of the ceiling broke and an enormous shadow appeared , that shadow was like of a demon with horns of a monster and an aura darker than black.

There was sudden chill in the hall , all the people froze with fear.

Akira take your sister and hide somewhere 'urged Kimi.

No I will help mom 'exclaimed Akira.

Just GO!!! 'shouted Kimi.

Akira was shocked to see the terrified look on his mother's face as if she saw her death . Just as Akira and Haruno started running for their hiding place they saw people becoming headless one by one . Akira clenched his sister so tightly as if he leave her hand for a moment she will be gone too . 

Why is this happening , Why is my family being killed WHY!!!! 'shouted Akira.

His eyes were filled with fear and grief 

Both of the sibling hid in the almirah shivering over the cries and deaths of the people they knew . That was the night of massacre.

It was end of the Ikigaya Clan .

After the screams end Akira came to the hall , to his dismay the hall became a pool of blood , he was confused and was looking for any survivors , after that he found his grandma Makiko who was on her last breath and had a hole in her chest.

Come here my child 'she called Akira with a shivering voice.

All that happened today was all my fault and death is what I deserved for what I did to him ,but you have to live and take care of your sister , this is not the end of Ikigaya Clan , PROMISE ME YOU WILL BE THE THRONE KING 'asked Makiko .Akira with tears in eyes and knowing he can't save his grandma put his hand on her hand to show that he will fulfill his promise . 

This is The Oath Of Blood of Ikigaya Clan Akira!! you have to fulfill it 'exclaimed Makiko with her dying breath.

With grief and rage in his mind Akira stood there reminiscing the shadow that changed his life and the Oath Of Blood he have to fulfill.

Akira carrying his sister ran out of the mansion , leaving behind the corpses of their family in hope to find the answers of this massacre and the person who did this to their family.

Outside the mansion Ryu was standing with his body covered with blood and injuries.

Akira -sama , Haruna-sam are you both alright 'shouted Ryu.

Yea we are both ok Haruna just fainted because of the dead bodies 'stated Akira.

I'm sorry I wasn't of any help ,it was fault that Ibuki sama sacrificed himself to save my life 'cried Ryu.

It was not your fault you should be thankful of the life given to you by Ibuki instead of regretting it and stop calling me sama 'answered Akira in an angered voice .

Now that they both calmed down they then thought of what to do next since now Akira had no place to go . 

Akira sam--  Akira do you have any place to go 'questioned Ryu. Akira denied to his question by noding his head as a no .

You can come to Doji Ajirama's place he is benefactor and old friend of Ikigaya Clan 'cheerfully asked Ryu . 

Akira agreed to Ryu's proposal and all three of them started their journey to their new life after the darkest night of their life which they cannot ever forget.

This is journey of Akira who changed after that day and vowed to become The Throne King to find all the answers about the fate of Ikigaya Clan and exact revenge on that Shadow