Mizuko Kayama, the 16-year-old heroine in training, trying to find her way through the hero world with the rest of her friends, while also trying to find the culprits who brutally killed her mother and father to seek her revenge. In time she realizes all the things that happen to her friends and her are all linked to her parent's case. While discovering these things she finds extremely valuable relationships with the others in her hero class, even a possible relationship with everyone's favorite hothead.