With summer vacation approaching, Koguma plans to spend it working for the school, shuttling papers back and forth to a high school in Kofu. Along the way, she finds herself learning more about maintaining her Cub, and the perils of inclement weather.

The girls pack up and depart on a road trip to Kyushu, the most distant location their Cubs will take them, in order to shake off their winter doldrums and embrace spring. Along the way, Shii finds what she needs to help her continue her café project.