4화: 코구마가 새끼와 함께 여름 방학 서류 배달 아르바이트를 하다
2021년 4월 28일 방영
This is the first summer since Koguma started riding the Cub. Reiko said that she wanted to do something huge for summer. Meanwhile, Koguma decided to work as a transport for school documents. She's transporting important files between schools with the Supercub. Before she starts her transport duty, Koguma went to Shino's shop again to change her oil.