Last Summer - S1.E8

The group has come to the beach on Aya's suggestion to try to enjoy a little downtime, but Aya actually had an ulterior motive behind the trip. Aya tells Tsuyuno how grateful she is for everything she's done, and the two girls make a promise to each other. However, when they return to the beach house, they find that Nijimi's panty stick has been stolen.