Yuhiro the copy of Alex was working in the industry and got a call from the head butler, he picked the call and said "Hello" but no one replied from the other side when he was about to cut the call he heard "Master, Don't freak out but something has happened to mistress and young-"
Before the head butler could finish Yuhiro screamed at him and asked "What happened to them are they fine".
The head butler replied that "When they were going to drop young mistress a fight ensued and they had to take a different road and when they were going to change lane for a shortcut they were hit by a truck from the side and an-"
"And what" Yuhiro replied in a worry. And the head butler with a sad tone continued again "And the car was slammed inside the building while the building fully collapsed and because of the faulty connects of the building the car caught on fire and they-"
Before the head butler could finish they "Where did the accident happen" and with a bit of hesitation the head butler gave him the location and without waiting for a moment Yuhiro rushed to the garage and took the first car that was available and drove as fast as he could to the location and when he reached there he saw a truck slammed into a building and the car parts but they were fully covered by debris and the police were insuring the safety of the people and some heroes were helping remove the debris. Yuhiro rushed towards the accident site and started moving debris with his bare hands with using only 10% of his strength.
At first it was easy for Yuhiro but after the small debris he was having a hard time removing it and his hands were bloody as his nails have broken but he then also didn't give up and didn't try moving the big debris but with the help of his head butler, he was able to and after removing the debris.
The head butler had come to the crash site to insure the safety of his master as the butler knew that he will not be in the right state of his mind. And his prediction was right as Mastwr was trying to move the bigger debris but was unable to in the process damaging his hand but with the help of his they were able to remove the debris.
After the debris was removed the car was in a very bad state and there was no way of opening so they had to cut the bonnet or accessing the car is impossible.
After the police cut throw the bonnet they saw three bodies, one in the front which is assumed to be the driver and two in the back assumed to be the mistress and young mistress.
There body was in moving seeing them Yujiro hugged there bodies and while he was moving the debris he was crying but now blood was coming out of his eyes and he was calling there name like a mad man. The butler had to intervene and had to make his Master unconscious or he may not control himself and do something dangerous.
After they put the body in the ambulance for the checkup. But when the ambulance was about to leave the ambulance blasted and everyone inside the ambulance had there bodies into pieces.
While the ambulance blasted the butler was princess carrying his master to take him in the mansion for rest but when he heard a explosion and saw that the ambulance in which the body was being taken exploded he was very angry and wanted to torture them with painful poison which will not kill them but will make there everybody part pain while there skin will be peeled and merged in salt to be licked by goats. But first they have to find the one behind this and while thinking he kept his master in the back seat and he sat on the driving seat to take him in the mansion.
And he thought that the police and heroes will handle this. And he drove of with his master still unconscious.
Next Day...
Yuhiro woke up and saw that the head butler was sleeping there and he again with worry asked the butler while waking him ask "Was everything a dream, Are Reika and Momo alright". But the head butler who woke up didn't answer and knew that it wasn't a dream so he started crying and shouting there name while keeping a hand in his face and continuously apologising to them for his mistake.
The butler seeing this view was also heart broken and will bring the person who did this to master and make him pay.
The butler told Yuhiro to calm and they will all try there best to find the killer while leaving the room to bring food for his master.
Seeing that the head butler left he again started shedding tiers and see his hands which were now bandaged.
The butler bought some food for him and he ate it with trembling hand and after he was done eating. The butler told him the news of the ambulance blast and the body parts were now in tiny pieces. Hearing the butler's report Yuhiro vomited what he eat and started crying again.
After shedding some tears he stopped crying and told the butler to leave him alone for sometime. The butler did want to leave as his master was not at all in the right state of mind but had to oblige his masters order.
He left and closed the door but before that he told a servant to keep guarding the room to not let master harm himself.
After a few days it was the same as Yuhiro didn't come of his room at all and only the head butler was allowed to go in the room.
After some more days the police to deliver the bodies of the three that died as they could not find anything and Yuhiro again cried and continued apologising to the dead bodies that were not in many pieces.
The next day a funeral took place and only the people who worked in the house were the only one that were invited and the funeral was done mostly in secret as the opponent industries can take advantage because of the boss is not in a right mindset to manage the industry right now.
After the funeral Yuhiro again started working but with a more serious mentality and always had a serious face on.
And a few months passed in a blink of an eye and one day when Yuhiro was working in his company with a serious face he got a call form the head butler.
Yuhiro picked up the call while working and when he heard what the butler had to say, he broke the pen in his hand and ran towards the garage with a face for revenge
and with the fastest car available reached the mansion and rushed through the security in the backside of the mansion the torture chamber.
There is a torture chamber in the mansion to remove all the people that are danger to the Yaoyorozu family.
And now inside the torture chamber there was a person being tortured by the head butler and he did everything to the person that he promised. Right then Yuhiro came inside and saw what was happening and the butler told him that after he put someone to investigate this and found out one of the deadliest assassian was the person who slammed the truck on the car which caused the death of both the mistress and young mistress but he is not telling the name of the person who gave the bounty but he took 20 million for it.
Hearing this Yuhiro became very angry and told the butler to leave them for sometime and the butler obliged and left the room to guard it from outside.
After Yuhiro saw the butler leave saw the assassian properly, the person was tied to a metal seat with most of his skin already torn, broken teeth, hands and legs broken and fingers turned in a way it shouldn't be and blood oozing out from all the parts of his body.
Seeing this Yuhiro hatred face became a smile then a crazy laughter and he couldn't stop laughing.
The assassian looked at the person standing in front of him and said "You, you..are...the...one...who told..me...to...kill.. th-" Hearing this Yuhiro stopped laughing and with a smile put a finger in his face to stop him from talking.
And he made the assassian go quite while circle him and suddenly stopped behind the assassian and plunged his hand in the man's vertebra and pulling it with 50% strength dividing the vertebra with the skill in the process while his upper portion took support of the chair that was restraining the dead body.
After killing it in the most gruesome way he thought of what happened that day when he left with his car to see the accident if mistress and young mistress that was informed by the head butler and while in the car he called the assassian to tell that he has alredy sent the money and called his original self to give him the news.
The original was delighted and hang up. The copy then did all the acting while the original was looking from afar and when he remember that he had mixed the sleeping liquid and if the police gets the body in one piece then they will suspect and not let him do his job so when the copy was trying to pick the debris and all the attention was on him the original put used the quirk [creation] and put a bomb that worked when more than a limit of weight is put to the ambulance without being noticed by anyone. And it worked as the ambulance blasted and there was no proof found as the body was in pieces.
After that some days passed and when the original got the news that the police has given the bodies back for cremation or burial as it is on the family of the people that died to decide. And after some days the funeral took place where the original was present with the appeared of Inko and created a maid dress with [Creation] and perfectly blended with the people attending the funeral as it was only for Yaoyorozu family and after they all left the original dug the bodies out and used [Predator] on them to strength his quirk and get all the knowledge
Fun fact: The Yaoyorozu family did inbreeding to keep the quirk in the family and also because the first person who got the quirk was a sister-con so he gave the first reason, from then on every one had to follow this tradition. Luckily Yuhiro instead of a sister had to marry his cousin as his parents were not able to produce any and Reika's parents were lost in a accident. One day by chance Reika found out from a person who could see someone's past, she was very angry and hated the part that she had to first marry someone blood related and second was never told that her cousin were rich and didn't even adopted her instead sent her into a orphanage while she had to suffer.
She didn't want the same fate happened to her daughter so she planned to take on the position of the head of the Yaoyorozu family by killing me and changing the tradition by letting her daughter marry to whomever she loved and wanted to be married to.
But and BUT instead of her husband who loved his family but made some mistakes in the past and wanted to correct them she was against a deranged psychopath who wanted nothing other than ruling the world.
She made the biggest mistake by just looking in his way and she had to loose her live to correct her mistake..