Five years have passed since the catastrophe. Robots for reconstruction had become an indispensable part of people's lives, spurring technological development. At lab 7 in Nerima University, Umatarō Tenma and Hiroshi Ochanomizu are struggling to install the next-generation artificial intelligence "Bewußtsein" into their new prototype, A106. However, they've already used up all their research funds, so part-time jobs are a must. Today, it was time for another part-time job at the Mecha City theme park. The two of them rush out of the lab in a hurry.