It was a normal day in the midoria household when suddenly a gun fireing got there attention and then suddenly dekus mum got shot through the heart (if you don't get that referance go on YouTube and type in shot through the heart by bon Jovi) at that point a man came in through the door and pit deku in a sack of potatoes
At the criminal base
(Deku wakes up) deku: where am I what do you want what happend to my mum. The villain slapped dekus face soooo hard his jaw cracked luckily they had a healer deku was torcherd for 2 years untill he couldn't feel emotions it was scary and his eyes looked life less and that's when he started training to become a assassin