Her name is Kokoro, the student you are taking care of. You are a SSS-rank hero, meaning you are one of the strongest beings on Earth. You decided to teach people on becoming heroes such as Mahito, the legendary S-rank swordsman, Maga, the S-rank sorceress and Trojanus, the S-rank hero with impressive strengh and warrior skills. Kokoro was born from a villain. He died by a fomer comrade of yours, Misaki, a SSS-rank heroine. Filled with hatred, she wishes to execute all heroes.