Episode 30

"Climax" is the thirtieth episode of the My Hero Academia anime and the seventeenth episode of Season 2.

Summary
Shoto encourages Tenya to be the man he wants to be and Tenya struggles to get up. Tenya is ashamed that he needs protection from his friends, Izuku and Shoto. Tenya remembers his brother's motivation for being a hero; that helping people is the best motivation for being a Hero. Shoto attacks Stain with a stream of ice concealed in it is fire but Stain dodges. Stain criticizes Shoto for relying on his Quirk too much and prepares to cut Shoto with his katana. Tenya agrees with Stain; that he is a failure as a hero and pales in comparison to Izuku and Shoto. Stain's Quirk wears off and Tenya gets up with the motivation of not wanting to be outpaced as a Hero by Izuku, Shoto and his brother. Tenya uses Recipro Burst and smashes his leg into Stain's katana, shattering the katana in half and saving Shoto in the process. Tenya then kicks Stain away.

Tenya apologizes to Izuku and Shoto for getting them involved in his problems, not wanting them to spill anymore blood for his sake. Stain criticizes Tenya for having a change of heart, saying that a man's character never changes and that Tenya is a fake Hero who prioritizes selfish desires; Stain says that people like the selfish Tenya are the "cancer" of society and that he is here to correct that. Shoto tells Tenya to pay no heed to Stain, but Tenya says that Stain is correct about him not being a true Hero. Tenya tells Stain that he cannot give up so easily as doing so means that Ingenium would die, much to Stain's anger.

Tenya asks Shoto to cool down his leg, but Stain attacks Shoto with daggers to which Tenya intercepts and falls down to the ground. Izuku regains his mobility and activates One For All Full Cowl, jumping off Shoto's ice platform towards Stain. Shoto cools Tenya's leg, restoring Tenya's mobility. Tenya uses Recipro Extend and leaps into the air towards Stain. Shoto encourages Izuku and Tenya to press forward with their attacks; Izuku punches Stain in the face with his enhanced might while Tenya hits Stain in the stomach with his speed enhanced kick.

At the other battlefield, the Nomu absorbs and releases Endeavor's flames but Endeavor mocks the creature's Quirk and pitiful attempt. However, Gran Torino tells Endeavor to be aware of the Nomu creature as it possesses multiple Quirks. The Nomu prepares to attack Endeavor with a tongue-like Quirk. Suddenly, Gran Torino propels himself at a great speed and smashes down into the Nomu, defeating it. Endeavor decides to let his sidekicks restrain the Nomu and tells Gran Torino to go to the address that he will give him.

Meanwhile, Izuku Midoriya's enhanced punch and Tenya Iida's Recipro Burst hit Stain. The combined might of Izuku and Tenya's attacks causes Stain to lose consciousness. However, Stain keeps himself awake and makes one last ditch attempt to kill Tenya by attacking Tenya with a blade. However, Tenya kicks Stain again and Shoto shoots a stream of fire at Stain's face, burning the Hero Killer's face. Shoto Todoroki and Tenya's additional attacks causes Stain to reach his limit, becoming unconscious and falls onto Shoto's ice, defeated. Shoto creates an ice ramp so that Izuku and Tenya can land safely. Izuku, Shoto, and Tenya remove Stain's weapons and tie him up.

Izuku, Shoto, Tenya and the pro hero leave the alley with the unconscious Stain in tow being pulled by Shoto. Tenya asks Shoto if he can be the one who pulls Stain to which Shoto denies Tenya's request due to Tenya's arm being badly damaged; the pro hero laments about being a burden but Izuku eases his worry since no one can defeat Stain in a one-on-one battle due to his Quirk. Gran Torino arrives at the address Endeavor gave him and encounters Izuku's group who have defeated Hero Killer Stain. Gran Torino propels his foot into Izuku's face, annoyed that Izuku did not stay put. However, he is relieved that Izuku is alright. Then, Endeavor's sidekicks arrive. Tenya apologizes for his un-heroic actions with Izuku saying that he is also sorry for overlooking his pain; Shoto tells Tenya to pull himself together because he is the Class President with Tenya complying.

Suddenly, the winged Nomu appears in the sky. Gran Torino sees the winged Nomu above and commands everyone to duck. The winged Nomu grabs Izuku and prepares to fly away. Gran Torino prepares to propel himself into the air to rescue Izuku and Shoto prepares his fire.

Shockingly, Stain regains consciousness and frees himself from the ropes with a blade up his sleeve. Stain licks off the winged Nomu's blood from the female pro hero's face and activate his Quirk. The winged Nomu becomes paralyzed due to Stain's Quirk and stops flying, dropping Izuku in the process. Stain stabs the winged Nomu's brain and defeats it, causing to fall to the ground. Stain grabs Izuku and saves him. Stain, despite being heavily injured, states that the "fake" pro heroes and the pathetic criminals in society are his targets for his purge, saying that everything he is doing is for a just world. Izuku and the pro hero who was injured by Stain are shocked at the hero killer's actions.

Meanwhile, Tomura is watching the events unfold and is displeased that nothing is going his way. Endeavor arrives and sees the hero killer; Endeavor prepares to launch an attack on Stain to which Gran Torino tries to make him stop.

Stain's bandaged mask falls off, revealing that he does not have a nose, shocking everyone. Stain, despite his heavy injuries, steps forward and states that the fake Heroes must be rectified and the word hero must be restored. Stain urges the "pretenders" to try and stop him. Stain continues walking forward and declares that the only one who is allowed to kill him is All Might. Stain unleashes a bloody malefic aura which instills fear into everyone present; one of the Pro Heroes fall down out of fear, Shoto and Tenya all to their knees, Izuku becomes terrified, Gran Torino becomes tense and even Endeavor takes a step back. Stain takes a step forward, but the grievous injuries of his perforated lungs due to his broken ribs causes Stain to finally lose consciousness. Everyone is shocked and stunned that even though the hero killer lost consciousness, Stain is the only one still standing up to fight against his opponent.

Anime & Manga Differences

 * Endeavor battling and defeating the muscular Nomu is shown in the anime.