The year is 2042. The world has been ravaged by kaibutsu, giant monsters that have emerged from the depths of the earth. The human race is on the brink of extinction. In a small town in Japan, a young man named Hiro is training to become a monster slayer. He is the last hope for humanity. Hiro is a skilled fighter, but he is also kind and compassionate. He knows that the only way to defeat the kaibutsu is to understand them.