Sekijiro Kan/Synopsis

U.S.J. Arc
Sekijiro and the other U.A. High School teachers arrive at the Unforeseen Simulation Joint to help Class 1-A and All Might drive off the League of Villains.

Forest Training Camp Arc
When Sekijiro and Class 1-B arrive at the Training Camp, Sekijiro tells his class that they have to extend their Quirks, that they should hurry because Class 1-A is already there and that he wants his Class to get the spotlight for a change. He then explains to his class that Quirks grow stronger as long as they keep on using them. Sekijiro notes that this training would be done as the students developed over time but they have to do it this way because they do not have the time. He then orders his students to join Class 1-A.

The next day Shota Aizawa goes to the facility for supplementary lessons alongside the five students that failed the test and finds Sekijiro teaching Neito Monoma. Aizawa asks him if he could put his students into a study exercise and Sekijiro does not have a problem with that since he had the same idea. They are all suddenly contacted by Mandalay, who informs them about the Vanguard Action Squad's attack and that his objective is to kidnap Katsuki Bakugo. Shota tells Sekijiro to look after the students and storms out of the building. Soon some students begin to arrive who managed to escape from the attackers in time.

After hearing another telepathic message from Manadaly authorizing the students to use their Quirks to defend themselves, Eijiro, Mina and Tenya ask Vlad King to allow them to fight in order to help. However, Vlad King refuses and explains that only the students in the woods have permission to fight with quirks because they need to defend themselves.

Suddenly they hear someone approach the door. Eijiro thinks that it may be Shota but Vlad realizes that it is not him, and quickly pushes Eijiro and Mina away from the door just before it is destroyed by a blaze of blue fire. Dabi enters the classroom, but Sekijiro quickly restrains him with his Blood Control Quirk and questions him about his goals and allies.

Dabi mocks him by saying that one of their goals is to damage the image of the the image of U.A. High School with the kidnapping of Bakugo. Vlad King tries to shut him up but Shota returns and Shota returns and kicks Dabi in the face, dissolving into some kind of mud upon being destroyed. Shota reveals to Vlad that he is nothing more than a clone sent there to provoke and distract them.

Shota says he'll return to the forest while Vlad King stays to protect the students. Vlad King questions this plan but Shota explains that the villains are using doubles of their strongest member to keep the Pro Heroes occupied to disguise the fact that the villains are few in number. In the end, the villains manage to capture Katsuki and flee, leaving numerous students injured.

One day after the League of Villains' attack on the training camp, Sekijiro and Shota are questioned by Naomasa Tsukauchi regarding the events that transpired at the training camp.

Hideout Raid Arc
Afterwards, Sekijiro, Shota, and Nezu appear in U.A.'s public broadcast where they apologize to society for their shortcomings. However, society still criticizes U.A. for being unable to protect the students and criticize their security measures for not ensuring the safety of the students. During the press conference, Sekijiro is afraid that Shota may lose his self-control due the hard criticism from one of the reporters,but Shota manages to stay calm and respond to criticism. The three say they are working closely with the police to rescue Katsuki.

That statement turned out to be more literal than expected, because thanks to an arduous investigation, the heroes and the police force had already discovered the main hideouts of the League, and raid the places at the same time. The League of Villains then realize that U.A.'s press conference was just a diversion so that the League of Villains' would lower their guard.

It seems that the heroes have emerged victorious, but at that moment All For One intervenes and ruins the entire rescue operation, leaving many heroes badly injured. In the end Katsuki manages to be rescued by Izuku, Eijiro and Tenya, but All For One uses her multiple Quirks to warp the league members to a safe place, staying behind to face All Might.

Like many others, Sekijiro, Shota and Nezu watch with concern the fierce fight between All Might against All For One, encouraging the number 1 hero not to give up. Finally All Might manages to defeat AFO, which is arrested and incarcerated in Tartarus, but the cost of his victory is very high, as he loses the One For All forever.

Days later, All Might meets with Nezu alongside Vlad King and Eraser Head. The principal thanks Toshinori for his victory against All For One. He tells him that he will continue as a teacher despite he can no longer be a hero and the critics. Nezu reiterates that they must instill faith and confidence in heroes. Sekijiro Kan agrees with Nezu and says that the whole incident should be enough to make everyone realize they're placing the entire burden on him all this time, and vows to nurture, raise, and protect the students more strongly than before.

Nezu decides that now is the time to implement the transition of U.A. to a boarding school. Nezu and Sekijiro will visit the parents of Class 1-B while Shota Aizawa and All Might will visit the parents of Class 1-A. They manage to convince all parents to allow their children to continue at the U.A.

Provisional Hero License Exam Arc
With only a few weeks left for the Provisional Hero License Exam, freshmen train their Quirks hard to improve them and pass the test. Wanting the students in class 1-B to also train, Sekijiro Kan and Class 1-B enter Gym Gamma, saying that now it is his turn to use the facility, but Shota replies that they still have 10 minutes to train before Class 1-B turn.

Next to Vlad is Monoma, who soon taunt Class 1-A by telling them that they will fail. Shota remarks that Class 1-A and Class 1-B will be taking the exam at different venues. Sekijiro states that the Provisional Hero License Exam is conducted every year at different locations across the country and different testing times; to avoid students from the same schools from clashing against each other.

The exam takes place, and all Class 1-B students achieve their Provisional Hero Licenses.

Shie Hassaikai Arc
The day after the Provisional Hero License Exam, all U.A. students and staff attend the opening ceremony at Ground Beta. There Nezu gives a speech about the current situation after All Might's retirement and how it will affect classes and their lifestyle. Sekijiro congratulates him when he finishes.

Before the U.A. High School students leave, Sekijiro introduces Hound Dog, the U.A's lifestyle counselor, who proceeds to growl and scream incoherently into the microphone. Sekijiro returns to the microphone and interprets Hound Dog's words to the students, reminding them to live a life of moderation, mentioning a fight between two students the night before.

U.A. School Festival Arc
At U.A. High School, Sekijiro Kan comments to Shota Aizawa on his Class 1-A's band and dance performance for the U.A. School Festival, considering it to be admirable since they are doing it for the other departments of their school.