We're girlfriends...now what?

It's the start of grade twelve and this year, Yamada and Kase-san are in the same class together! Yamada's thrilled to be dating her track-star girlfriend but she's having trouble getting a grip on just what 'going out' even means. Before she can find a solution to her problem, though, their school trip to Okinawa begins! Will Yamada and Kase-san ever figure this whole girlfriend thing out -- or will misunderstandings split them apart forever?