There's only one month left until the July field trip, and Hina Fushimi is still making enthusiastic advances on Ryou Takamori. But when a girl named Ai Himejima, another one of Ryou's childhood friends, transfers to their high school, Ryou and Hina's relationship hits a snag. Faced with a rival in love, Hina redoubles her efforts to win Ryou over by resorting to even bolder feats of flirtation. Ryou, meanwhile, continues to act completely oblivious!