It's the Mountains! It's a River! ⇔ Barbecue!

Part A: While Summer homework still looms over Sakaki and Mayoi's head, they, along with Hime, Io, and Tsumiki, go for a camping trip. Tsumiki gets left behind at a train station, and Io jumps out a window so she isn't left alone. When they arrive, they play in the river, and it ends with Tsumiki putting Io's head on her lap as he sleeps.

Part B: Io barbeques for the group, and they talk about their dietary habits. They then shower, and Io helps Tsumiki dry her hair. As night takes over, the group decides to play with fireworks. After Io makes one of his romantic comments, nosedbleeds ensue.