Tenko begged him for help and the area around them is destroyed. Tenko runs to him for help, but his scared father grabs a shoot gun to protect himself and orders him to stop. This proves to be a mistake as an enraged Tenko charges at his father.

With a full intent to kill him and touches his face; ultimately the spreading decay ends up destroying the entire house. Tenko relishes in ending his father's abuse. Following the deaths of his family, an orphaned Tenko is left to fend for himself on the streets.

Tomura recalls that people often passed by him but never offered to help him, because of his ominous appearance and assuming that a hero would take care of it, leaving him to be ignored. Tomura begins to think this was punishment for his actions.

The memories slowly fade into the recesses of his mind. Eventually, an elder lady saw him and was freaked out by his face before he heard a girl's voice and she was calling him onii-chan before touching his hands with her owe as she pulls him up.

She was the only one to not decay from his Quirk as it feels nice and she was caring towards him no matter what as he got adopted and was called Tenko Midoriya. Inko's a nice lady and treats him like he was her own son as he shares a bed with his new sister.

For two years, everything was fine and his sister helps him out with his Quirk and helps train him as she doesn't fear him at all really and never will, but one day that all changed as they got kidnapped and he was forced to watch his sister be experimented on.

He couldn't take her screams of pain and agony making him to use his Quirk to save her and got her out of there before Inko shoved him into the man's chest, telling the man she can't protect both him and her daughter.

"I don't care if he goes Villain or not as long as he is safe!" And then the door was shut in his face as both could hear the two crying while his sister was crying for him, wanting him making him to cry as the man went home and left him be to calm down.

Tenko was given his own room by All For One and Kyudai Garaki "gifted" the young boy with the disembodied hands of his deceased family members. All For One taught Tenko to embrace the urge he felt whenever he felt it. He assured him that the impulse didn't have to be controlled, nor was it necessarily a bad thing.

One day, Tenko got into a fight with two thugs, but he refuses to attack them with his Quirk much to his shame, but he knows his sister would have done it to protect him. Later, he threw a tantrum while All For One spoke with him about the very incident.

All For One tried to console the young Tenko, telling him that he should act as his heart fully commands, otherwise he would suffer for it later on as he remembers. He asked Tenko one more time what he would like to do. Tenko knew what he wanted to do

Tenko replied that he wanted to kill the two street thugs, noting that he couldn't hold back his feelings anymore. All For One told him to try his best. Later on, Tenko meets the thugs again, now wearing the hands of his family around his body.

They called him creepy and ask what he wanted with them as he raised his hand towards them. He used his Quirk to kill the two men, leaving only a pool of blood and several disembodied limbs behind. He thought about how sick and disgusted he felt, but...

'I also noticed that...' Tenko thinks with some confusion.

'That I... I felt completely calm and feels like I was allowed to do anything I wanted.' On a rooftop nearby, All For One and Kyudai Garaki witnessed the bloody event. Kyudai expressed surprise at the events below him as he thought it was impossible really.

"I believe that Tenko had lost his memories." He was only corrected by All For One saying that his memories were just shut away. He noted that his family's hands would serve to restrain him fully keeping all, but his negative emotions suppressed.

He saw that Tenko is subconsciously keeping his Quirk in check like he had some training in it and he knows it's from his sister really. Smiling, All For One expressed pride in seeing Tenko's first step down the path to becoming the Symbol of Fear really.

Later, All For One congratulated Tenko for his work, noting that he had been reborn and gifted him with five new hands: two from the street thugs and one other hand, which All For One calls "a little bonus". All For One also renames Tenko as Tomura Shigaraki and made it legal.

When Tenko asks for the name, All For One elaborated that "Tomura" came from the word "Tomura" which means "to mourn" while "Shigaraki" is All For One's real last name. Tenko, now Tomura, asked Shigarkai as that was Inko maiden name before being married.

All For One was shocked and looks into it and then four days later, Tenko felt pain as he felt something growing out of his body and someone cutting his shirt allowing them to come out and then he passed out after calling out to Inko and his sister.

All For One shows him his new look and he was shocked as he had dragon wings coming from his back and a tail coming from where his tailbone is and he had two horns coming from his forehead with scales from different areas on his body really.

"Some tests were done and it's compellable with Decay meaning both fused together to make Serpent Dragon's Decay or Decaying Serpent Dragon." Kyudai Garaki said as he shows the results to All For One who was shocked even more.

'Imoto?' Tomura guessed as she could of wished and then it showed up since he was asleep for two months and he kept going to school, but with his name changed and he managed to hide his new look be making the wings be a tattoo and the tail was a starburst mark like his horns really.