To capitalize on their last summer, the group decides to take a trip for a full week to a beach house.

The group takes a nature walk and ends up wondering into a dark cave.

The group struggles to figure out what to do, so they come together to start fooling around like teenagers would.

Shiori and Hikigaya are continuing to feel this strange sensation, so to make things more complicated, the group decides to lock them in the closet.

Returning home from the waterpark, Shiori falls ill with something no one knows. So Hikigaya goes to check on her.

The Summer Festival is here, so the group gets dressed up for the occasion. With everything that's happened so far, Shiori decides it's time to talk.

The summer getaway is up, so the group has to return home. This simple task is then made quite complicated.