Joseph Solom enrolls in UA to become a Support hero for the specific intent of find out what he can and can't do. While there he makes friends with Keniya Jinsoku, a student who can produce iron from his diet, and Denchi Kaiho, who can use spicy foods to produce fire. Villains decide rookies would make great subjects for trigger tests. Keniya and Denchi belong to Niklas Sagara.