第 4 集: Koguma 接下了送交學校文件的暑期打工，還帶著小熊
2021年4月28日 播出
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.