UA High School must regain the public's confidence after the surprise villain attack during class 1-A's training session. Although some of the teachers were gravely injured in the attack, Izuku "Deku" Midoriya and his classmates must continue to learn and train, and utilize their quirks in varying environments and circumstances. Boku no Hero Academia: Sukue! Kyuujo Kunren! follows class 1-A as they attempt to finally complete their training. However, there's a masked figure roaming around the training center. Have the villains responsible for the previous incident returned to finish the job? If so, are the students ready to fight back?

In Ming dynasty, legend goes that there is an ancient deity's book covering a wide range of technical issues, including the unique method of manufacturing the weapons of deity, which has the power to destroy everything. He who gets that book rules the entire nation. Reportedly, in ancient times, deity made the royal family keep the book, as a sign of acknowledging their ruler-ship. However, in Yuan dynasty, the Mongolians invaded the central plain and ruled the nation. There was chaos everywhere and the book which was supposed to be enshrined in the Imperial Palace was somehow missing and reappeared in the outlaw societies, luring lots of forces to fight for it. When Han people regained the ruler-ship in Ming dynasty, though the deity's book was found back and enshrined in the Imperial Palace again, those outlaw forces already knew that the book was more than just a legend! It did exist! So they plotted to steal it out. There are there most famous robbers in the outlaw societies: Hell-fire monk, Hua Daochang the thousand-face fox and Duan Yun in white. One day, on the ghost festival, they sneaked into the Imperial Palace, trying to steal the most precious treasure, competing for the title of "the most famous robber." At last, the hell-fire monk stole the deity's book. The emperor founded the Imperial Guards to serve as his personal bodyguards and imperial secret polices and spies, among whom, there was a young and inexperienced guard—Yuan Xiaotang，the hero of this animation. The emperor demanded the Imperial Guards catch the three robbers and find back the book. That's how the story begun!

After his high school graduation, Yuuki Wakura realizes it has been five years since his sister's disappearance during a "Mato disaster." Throughout Japan, mysterious entrances have opened to a dimension called "Mato"—a demonic metropolis filled with disastrous monsters known as the "Shuuki" that threaten the safety of humans. However, a new hope arose, as the discovery of a Mato fruit that grants supernatural abilities exclusively to women allowed them to fight against the Shuuki. Due to this, a new matriarchal government was formed, establishing a female organization called the Anti-Demon Corps, which caused men to fall to the bottom of society. When Yuuki suddenly finds himself in Mato, he is unable to escape on his own. But just as he anticipates a gruesome end by the Shuuki, a girl in a militia outfit appears and protects him. As the chief of the Seventh Unit of the Anti-Demon Corps, Kyouka Uzen is ambitious yet devalued by her own peers due to her power being deemed unusual. Now in a life-or-death situation, Kyouka takes the opportunity to find out the true potential of her superpower by using Yuuki: in order to defeat the Shuuki, he has to become her slave.

Loid Forger, an elite spy, is warned by his handler that he may potentially be reassigned from his ongoing mission, Operation Strix. To maintain his position, he must make significant progress toward the operation's objectives, which involves having his adoptive daughter Anya earn sufficient Stella Stars to become an Imperial Scholar at Eden Academy. After learning of a cooking contest that awards the winning student with a Stella Star, Loid researches the judge's preferred dessert to help increase Anya's odds. However, perfectly recreating the judge's favorite meremere requires more than just following a recipe. Thus, the Forgers embark on a vacation to the Frigis region to try an authentic meremere. Not all goes smoothly on the trip, as the Forger family ends up entwined in a sinister plot to reignite war between the countries of Ostania and Westalis.