Episode 28

"Midoriya and Shigaraki" is the twenty-eighth episode of the My Hero Academia anime and the fifteenth episode of Season 2.

Summary
Gran Torino tells Izuku that if he can move around while having One For All coursing through his body, then he will be drawing a clear line from how he was during the Sports Festival. Gran Torino says that their mock battle will be three minutes for starters. The mock battle begins and Gran Torino hits Izuku from behind, stopping the flow of One For All throughout Izuku's body. Gran Torino attacks Izuku from all directions while Izuku stands helplessly unable to counter. After falling to the ground, Izuku realizes that Gran Torino's speed is too fast for him to counter and decides to regroup. Izuku crawls under the couch and activates One For All throughout his body again. Gran Torino heads towards the couch, but suddenly, Izuku punches the couch away, sending it flying and stopping Gran Torino's attack.

Now that One For All is flowing throughout his body, Izuku leaps into the air and nearly manages to hit Gran Torino, however, the elderly Hero manages to dodge in the nick of time. Gran Torino jumps forward and prepares to attack Izuku from behind, but Izuku dodges the elderly Hero's attempt by jumping into the air above him. Izuku, seeing that he is in a perfect position, sends a One For All enhanced punch at Gran Torino. However, the elderly Hero manages to dodge Izuku's attempt. Izuku starts falling down while Gran Torino leaps from the wall and strikes Izuku in his stomach, smacking Izuku down onto the ground and causing One For All to stop its flow.

Gran Torino sees that three minutes are up and ends the mock battle for now. Izuku laments on his lack of ability to keep the activation of One For All throughout his body properly. However, Gran Torino compliments Izuku's intelligence. The elderly Hero notes to himself that Izuku has dramatically changed in such a short space of time and compliments Izuku for being able to graze him (a cut is shown on Gran Torino's face) even though he was using his own power earnestly. Gran Torino states Izuku that he must get used to using One For throughout his body and informs him that they will continue training after breakfast. After breakfast, Izuku continues his training with Gran Torino.

At U.A., Naomasa meets with All Might. He tells All Might that the Police Force have tried everything to get information out Nomu, however, everything they tried did not work. Naomasa says that they instead looked into Nomu's background through DNA analysis and have discovered that Nomu was once a human with a criminal record. Naomasa explains that the DNA analysis also revealed that Nomu has the DNA of at least four different humans mixed with his own. Naomasa concludes that Nomu is an artificial human made to measure up to multiple Quirks and that having all the DNA in his body as well as his body modified caused Nomu's brain activity to stop. Naomasa tells All Might the real issue is that Nomu's DNA is of primary concern because it contains multiple Quirks. Naomasa says that Nomu could not have acquired multiple Quirks in any way (unless Nomu acquired the Quirks through advanced genetic familial permeation). Naomasa theorizes that someone with a Quirk that can grant Quirks is behind Nomu's acquisition of multiple Quirks. Surprised yet angered, All Might becomes concerned that he has started to move.

At the League of Villains hideout, Stain's meeting with Tomura turns into a fight. Stain overpowers Tomura with ease and pins Tomura down onto the ground, stabbing Tomura's right shoulder with one of his daggers while pointing the other dagger at Tomura's neck. Stain tells the pinned down Tomura that creeds and convictions are need to accomplish anything and without them the amateur villain will not survive. Tomura desperately asks Kurogiri to send Stain away, but Kurogiri is unable to move at all presumably due to Stain's Quirk. Stain states his hatred for the current society; believing it to be overrun by fake Heroes and Villains who throw their power around timelessly. Stain prepares to cut Tomura's neck with his dagger as well as the hand on his face, but Tomura grabs the dagger with his hand and begins disintegrating it. Tomura tells Stain that while he doesn't have such serious creeds, he does have a desire; which is to crush the society where All Might is set up in, wanting to plunge it into the ground. Tomura completely disintegrates Stain's dagger. Stain leaps backward away from Tomura. Stain concludes that while their goals are different, his and Tomura's desire to destroy the current society is one thing they have in common. Stain tells Tomura that he has tested his mettle and concludes that he has a crooked creed dwelling within him and wonders what that creed will sprout. Stain declares that he might spare the League of Villains and won't dispose of it once he has ascertained them with his own eyes. Frustrated, an angry Tomura demands that the Hero Killer leaves; seeing that his business with the League of Villains is over, Stain demands to be returned to Hosu as he has unfinished business there. Stain is warped back to Hosu.

In the Hosu Hero Office, Tenya has arrived back from patrolling. Tenya has gathered information on the Hero Killer Stain, the villain who severely injured his older brother and realizes that Stain has an attack pattern. Tenya concludes that Stain will without a doubt be in Hosu to attack three more Pro Heroes. Tenya, in a silent rage, tells Stain to appear so that he himself can dispose of Stain with his own hands.

It is the third day of workplace training. It is 5:00 PM and Izuku is on the floor injured due to his training, having been training since the first day. Gran Torino decides to end Izuku's training in One For All for now, not wanting Izuku to become stale due to fighting him all the time. Izuku protests but Gran Torino denies Izuku's request to continue training in One For All. Gran Torino declares that they will move on to phase two which is workplace experience. Izuku cleans himself up and puts on his Hero costume. Izuku and Gran Torino leave the apartment. Gran Torino tells Izuku that fighting him all the time will make him stale and now wants Izuku to experience fighting in all types and kinds of situations. Gran Torino tells Izuku that they will be going on an excursion and calls for a taxi. In the taxi, Gran Torino explains that highly populated areas are where crime is rife, causing Izuku to ask if they will be taking a train to Shinjuku to which Gran Torino says they will. Izuku realizes that they will be passing Hosu along they way and begins thinking about Tenya, worried about him and decides to contact him later. The taxi takes Izuku and Gran Torino to the train station where they board a train that will take them to Shinjuku.

Later that evening In Hosu, Tenya is out patrolling again with Normal Hero. He asks Tenya if he is chasing after the Hero Killer Stain, thinking that would be the only reason Tenya came to the Hosu Hero Office. Normal Hero tells Tenya not to act out on a personal grudge. He apologizes for his question to which Tenya replies that he appreciates his warning. However, Tenya ponders that if he doesn't get revenge, what should he do with his rage, clenching his hand into a fist in anger.

At the same time, Kurogiri warps himself and Tomura to Hosu and meet with Stain. Tomura notes that Hosu is quite prosperous while Stain says his goal is to reform Hosu by sacrificing the "fake" Pro Heroes that work there. Stain states his belief; that the title of Hero should only be bestowed onto people who achieve great undertakings, saying that there are too many "fake" Heroes that only work for money. Stain leaves to finish his business, saying that he will keep appearing until society realizes its error and jumps off the building. After Stain leaves, Tomura complains about Stain's constant preaching, to which Kurogiri tells Tomura that he shouldn't mock Stain for his preaching, stating to Tomura that Stain's villainous methods have produced great results which intrigues Tomura. Tomura concludes that he and Stain will never get along and hates the Hero Killer. Wanting to relieve his anger through destruction and knock down Stain's reputation, Tomura orders Kurogiri to release the Noumus. Kurogiri warps three Noumus to their location and Tomura orders the Noumus to attack Hosu.

It is now nighttime; the train that Izuku and Gran Torino are on passes Hosu. On the train, Izuku tells Gran Torino that they will arrive at night, to which Gran Torino replies that they will, explaining that many villains appear at night and thus they will be able to get experience more easily. Izuku takes out his smartphone and sees that Tenya has read his message but did not reply. Suddenly, the train experiences an emergency stop and a Pro Hero comes crashing into the train, much to Izuku's and Gran Torino's shock. Immediately afterwards, a Nomu appears. Izuku tries to take action, but Gran Torino orders Izuku to stay put. Gran Torino jumps from his seat and slams himself into Nomu, propelling the Nomu along with himself out of the train and into the air above Hosu. Izuku tries to check on Gran Torino's safety but sees that Hosu is ablaze, shocked at what is transpiring and starts worrying for Tenya's safety.

Stain is in an alley, overhearing the chaos in Hosu and realizes that Tomura has made his move. Although annoyed by this, Stain decides to leave Tomura to his own mechanisms for now while he finishes his business, preparing to kill a Pro Hero called Native with his katana. However, Stain feels the presence of someone approaching him from behind and uses his katana to slash at the person, knocking the person down to the ground as well as knocking off the person's helmet and glasses (which is revealed to be Tenya). Stain sees that the person who tried to attack him is a child, telling the child to leave. Tenya gets up, telling Stain that he has been searching for him and looks at the Hero Killer with vengeful eyes. Stain points his katana at Tenya and says that he has avenging eyes, warning Tenya to not meddle with him and that if the situation demands it children will also be targets. Stain prepares to go and finish his job of killing Native. Seething with rage, the angered Tenya yells to Stain that he is the brother of a Pro Hero he cut down and he has come to stop Stain in his stead. Tenya tells Stain to never forget his Hero name; Ingenium, which is the name of the Hero that will take him down. Seeing that Tenya is serious about being a Hero, Stain tells Tenya to prepare for death.