Nerima University's school festival, the "Nerima U Festival," begins. Umatarō and Hiroshi's lab 7 also sets up a stall at the outskirts of the refreshment booth street. Since they can't pay for the parts of A106 with their part-time jobs, they decide to make some money by setting up a booth. Making udon noodles were the A10 series robots from lab 7. Hiroshi and A106 went out with Ran to promote the lab 7 udon. The robots work diligently, but for some reason, A105 is nowhere to be found.