Koharu meets Hiyori's childhood friend Koi, who works at a fishing shop. Hiyori arranges a trip to a designated fly fishing location for Koharu.

Hiyori, Koharu, and Koi go on a fishing and camping trip with their families.

Koharu gets frustrated by Hiyori trying to help her so much as she's fishing and Koi celebrates her sixteenth birthday.

The girls go fishing on Ichika's boat and invite Futaba to come with them. Later, they all enjoy a nice meal at Hiyori and Koharu's house.

Koharu tries to convince her dad to let her go on a fishing and camping trip with just Koharu and Koi, which causes a disagreement in the family, and results in Koharu and Hiyori running away from home.

All of the girls finally go on their autumn fishing and camping trip, and Koi thinks back on the past.

Koharu's birthday is coming up and the girls try to figure out what to get her. Meanwhile, the girls learn how to tie some flies.