Episode 23

"Shoto Todoroki: Origin" is the twenty-third episode of the My Hero Academia anime and the tenth episode of Season 2.

Summary
The battle starts with Izuku trying to strategize against Shoto. Shoto uses his Quirk Half-Cold Half-Hot and shoots pillars of ice towards Izuku on the ground. Izuku uses One For All on his middle finger and flicks it causing a shockwave of wind pressure that destroys Shoto's ice. Izuku then does the same thing again with his index finger to strike Shoto which hits him but Shoto creates ice behind him to prevent himself from being blown out of the ring. Shoto then uses his ice power on the ground and Izuku destroys the incoming ice using the wind pressure from his Quirk. Using the ice, Shoto creates a board of ice to get into the air with. He then uses his ice power on the ground again, knocking Izuku back and in the process causes Izuku's foot to become trapped in the ice.

Shoto starts to attack the defenseless Izuku but Izuku creates another wind pressure attack which frees himself and knocks Shoto back. Shoto, noting that Izuku is in a critical position after seeing his broken fingers decides to end the battle and launches another wave of ice. However, Izuku fires another wind pressure attack destroying the ice which shocks Shoto. Izuku criticizes Shoto for only using half his power to aim for the top and says that he hasn't even managed to injure him with that half power. Izuku clenches his broken right hand into a fist and yells at Shoto to fight him man to man. Angry, Shoto wonders what Izuku is planning.

After Izuku yells at Shoto to face him directly, Shoto thinks that his father paid Izuku to go all-out against him. Enraged, Shoto charges towards Izuku. However, as he gets close to Izuku, Shoto starts to experience the frostbite from using his ice power too much, and his movements become sloppy, which stops him from evading properly. This causes Shouto to get hit in the stomach by Izuku's One For All-enhanced punch, knocking Shoto down onto the floor and becomes slightly injured. However, Shoto gets back up and launches a wave of ice at Izuku, but it is weaker than before. Izuku destroys the ice attack with a blast of wind pressure and knocks Shoto back. Shoto asks Izuku why he is going so far, to which Izuku replies that he wants to live up to his mentor's expectations and wants to become an awesome hero who can answer people with a smile. Shoto is hit by Izuku again who states that while he may never understand Shoto's circumstances and resolution, he thinks that becoming Number One without using his full strength and doing it to disown someone is a joke which causes Shouto to tell Izuku to shut it.

Shoto starts remembering his miserable past; about how his father started to train him at 5 years old to become a hero to the point of throwing up. Shoto also remembers how his father was abusive towards him and his mother as well as preventing him from being with his siblings. Meanwhile, Shoto begins to experience the full effect of his frostbite, causing icy marks to appear over his right side. Shoto, unable to move properly, is hit by Izuku again. Shoto remembers the incident of where his mother threw boiling water over his face and his father admitted her to hospital due to the incident, which caused Shoto to start hating his father.

As Shoto gets up, Izuku tells Shoto that his fire power ''belongs to him and only him. ''After Izuku says these words, Shoto finally remembers what his mother said to him in the past; that he isn't a slave to his bloodline and can become whatever he wants to be. Touched by his mother's words and moved by Izuku's words, Shoto decides to activate his fire power, setting the left side of his body ablaze (causing Endeavor to smile wickedly in satisfaction), telling Izuku that he wants to become a hero as well and smiles.

Endeavor, filled with joy and happy to see his son finally deciding to use his fire power, walks down from the bleachers to watch the match at a closer range, telling Shoto to surpass him and realize his ambition. Both Shoto and Izuku power up for their final attack; Shoto launches a great wave of ice at Izuku while Izuku jumps using One For All to get as close to Shoto as he can and launches a great wind pressure blast at Shouto. Cementoss creates a cement wall between the two combatants in an attempt to stop them. However, both Izuku and Shoto press onwards with their attacks. After thanking Izuku to himself, Shoto uses his fire power to ignite the cold (generated by his wave of ice) to create a huge wind blast which, along with Izuku's wind pressure attack, creates a huge shock wave which blasts both of them back and destroys Cementoss' cement wall in the process. The shock wave is felt throughout the entire arena.

After the shock wave subsides and the dust and smoke clears, Shoto is seen standing in the ring with a quarter of his shirt ripped off and without any injuries. Izuku, however, is standing out of bounds. Izuku finally succumbs to his grievous wounds and falls flat onto the ground. Shoto is declared the winner and thus Izuku is eliminated from the tournament event.