Sensei sees Chika, Yumi, and Chinami at a bus stop. Yumi wants to tell him to go away, but is trying her best to behave around Chinami. They're going to the beach, and Chinami invites Sensei along. He agrees, claiming that it's "basically a scientific research trip" to find out more about the area, not just an opportunity to see girls in swimsuits. At the beach, Sensei decides which of the three to try to hang out with.