Pool and Shirt ⇔ Homework
Part A: It's time for summer uniforms and the students are assigned to pool cleaning. It does not take long for them to make some mess of it.
Part B: The afternoon before the test, Mayoi suggests a study group meeting in Io's house. Sakaki cannot go because he has a shift in Hatch Potch, so it is Io and the three girls. After the test, the weather turns rainy and there are fewer umbrellas than needed.