Watch My Hero Academia ONA Online

In a world filled with superpowered Quirk users, college student Kouichi Haimawari's dream is to become a hero just like the ones he so admires. Unfortunately for him, he finds out that there is only so much he can do with a sliding ability that gives him about as much speed as a bicycle. Thus, he is drawn to extra-legal, simpler work and takes on various local tasks beyond the grasp of the police and licensed heroes. However, a chance encounter with two misfits, a brash brawler vigilante who goes by Knuckleduster and the online sensation Pop☆Step, gives Kouichi the opportunity he has always dreamed about. With a dangerous new Quirk-enhancing drug turning ordinary people into instant villains, Kouichi finds himself accompanying the two in a quest to stop the drug from spreading. As the trio tries to get to the bottom of the case, the chaotic team looks to put a stop to wrongdoers that go overlooked by the law.

The stage this time is the UA dormitory just before season 5's Endeavor Internship arc! In the middle of winter, a hot and blustery cold battle is unfolding at Heights Alliance! Third-year Mirio Togata appears suddenly as the first-year students in Class A are bored during their ban from going outside. He brings with him the card game "Yuuei Heroes Battle," created by the support class. As each student picks cards and joins the fierce battle, there seems to be more to the game than meets the eye. At the end, who will emerge victorious?

In this brand-new adventure, some Class 1-A students are sent to hone their survival skills at a training course. Having yet to receive their provisional licenses, they're eager to cut loose and have a little fun. They quickly discover that the danger they face is no simulation! It's going to take their combined training, teamwork, and quick thinking if they're going to pass this assignment! (Source: Funimation)

The fourth movie.

In My Hero Academia: World Heroes’ Mission, a mysterious terrorist group called the Humanize are introduced. They strongly believe in the "Quirk Singularity Doomsday Theory." The theory states that as future generations continue to be mixed with the Quirk genes, the power it holds will lead to humanity’s demise. Furthermore, Humanize believes that Quirks are a disease, and so, they plan to “cleanse the world” by exterminating anyone who has one. Humanize planted "Ideo Trigger Bombs" in various countries, and these explosives are said to make a Quirk-user lose control of their Quirk, leading to mass destruction. To save and protect everyone, Pro-Heroes from around the world, and the U.A. Academy heroes-in-training, unite to thwart the efforts of the mysterious group.