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.

After the defeat of Myouri Unzen at the hands of Medaka Kurokami and her Student Council, peace has returned to Hakoniwa Academy—at least, for a short while. Soon, Medaka, Zenkichi Hitoyoshi, Kouki Akune, and Mogana Kikaijima find themselves wrapped up in another sinister scheme, known as the "Flask Plan," led by the school's principal himself. However, the council's first problem is to deal with a whole new group of superhuman students calling themselves the "Thirteen Party," led by the egotistical but powerful Oudo Miyakonojou. With the mysterious Flask Plan, Oudo's tyranny, and the resurfacing of an old enemy, the state of Hakoniwa Academy is far from tranquil, and Medaka and her companions have their hands full as things only get a lot more abnormal. [Written by MAL Rewrite]

Medaka Kurokami is, in the truest sense of the word, perfect. Beautiful, intelligent, and athletic, Medaka's dream is to make others happy. So when she runs for Student Council President of the prestigious Hakoniwa Academy, winning the election with 98% of the votes is only to be expected. The very first thing the boisterous new president does is set up the "Medaka Box," a suggestion box allowing students to submit any kind of request for assistance. Together with the cynical Zenkichi Hitoyoshi, her childhood friend who has been strong-armed into helping, Medaka fulfills these requests at a ridiculous rate. For every job completed, she adds flowers to the student council room, with the aim of filling the entire school. However, the two are about to find out that helping others may be a lot harder than they think as they begin to uncover a devastating plan centering on the academy and even Medaka herself! [Written by MAL Rewrite]

Ichigo Kurosaki is an ordinary high schooler—until his family is attacked by a Hollow, a corrupt spirit that seeks to devour human souls. It is then that he meets a Soul Reaper named Rukia Kuchiki, who gets injured while protecting Ichigo's family from the assailant. To save his family, Ichigo accepts Rukia's offer of taking her powers and becomes a Soul Reaper as a result. However, as Rukia is unable to regain her powers, Ichigo is given the daunting task of hunting down the Hollows that plague their town. However, he is not alone in his fight, as he is later joined by his friends—classmates Orihime Inoue, Yasutora Sado, and Uryuu Ishida—who each have their own unique abilities. As Ichigo and his comrades get used to their new duties and support each other on and off the battlefield, the young Soul Reaper soon learns that the Hollows are not the only real threat to the human world. [Written by MAL Rewrite]