Prodigies Jogoro Kobato and his shy friend Yuki Osanai just passed their highschool entry exams for the same Funato High. Both have made a promise to support each other to become "ordinary people" who won't stand out. Jogoro tries to hide his obsession in cracking mysteries and flaunting his knowledge. Yuki on the other hand used to be...

One day, highschool student and part-timer Yomogi Asanaka is on his way home and meets a starving man named Gauma, a self-proclaimed "Kaiju user". After generously giving him a leftover sandwich Gauma swears he would repay him one day and ends up following him around. One day a girl named Yume Minami infamous for asking boys out but...