Kacchan
BN // MHA S1 EP7

2
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Five minutes pass, and Team A enters the building, but before getting too far, Katsuki attacks them. His sneak attack only manages to damage half of Izuku's mask ; the latter was able to evade while saving Ochaco. Katsuki attacks again, but Izuku catches his swing. Then, Izuku shoulder-tosses the surprised Katsuki into the ground, garnering praise from his fellow classmates watching from the projection room with All Might. Izuku reveals he has been taking notes on Katsuki for years with the same notebook the latter burned. Izuku knew that he started every fight with a right hook and was able to counter. Izuku doesn't back down from Katsuki, telling his former bully that he is no longer the weak and defenseless Deku. Infuriated at his audacity, Katsuki voices his hatred of Izuku.
Deku vs. Kacchan { γγ―vsγγ£γ‘γγ , Deku BΔsasu Katchan? } is the seventh episode of the My Hero Academia anime.
Summary.
Deku and Kacchan as children.
"Deku" and "Kacchan" grew up in the same neighborhood and have known each other since they were little kids. Katsuki always felt superior to Izuku, especially after developing his quirk. However, Izuku still never treated Katsuki like he was better, and even tried to help Katsuki after he fell into a river. Katsuki only took this as an insult, like Izuku was looking down on him. That same anger has carried over years later into the Battle Trial.
Story.
No longer children, Izuku refuses to allow Katsuki to bully him any longer and shouts the defiant words that he won't back down any longer. Katsuki is interrupted by a message from Tenya, asking for a status update. An angry Katsuki only tells him to defend the weapon before silencing his communication. Back on the offensive, Katsuki goes for a flying kick to Izuku's head but is countered by Izuku's hero knowledge once again.