Summer has arrived at last, and with it comes the promise of summer break for the students of Lillian Girls’ Academy. Sachiko and Yumi retreat to the summer home of the Ogasawara family for a season of rest and relaxation, but their rosy trip soon sours when some old friends of Sachiko’s unexpectedly drop in. These wealthy snobs turn up their noses at Yumi and Sachiko’s relationship — and if Yumi isn’t careful, her blissful summer at Sachiko’s side could come to an abrupt and tearful end.
Sachiko takes Yumi for a holiday in her summer home. While there, Sachiko's acquaintances make trouble for them.
Lillian and Hanandera collaborate on a school festival, and Yumi tries to fix Sachiko's hatred for men.
Hosokawa Kanako, a first year, sees Yumi as the ultimate embodiment of perfection. When preparations for the Hanadera Festival begins, Kanako tries to keep Yumi away from it due to her hatred of men and her fear of having Yumi be corrupted.
Lillian's School Athletic Festival begins, and Kanako and Yumi make a bet to settle the problems which began between them last episode.
The second year students go for a week's study-vacation in Italy. Yumi meets up with Shizuka Kanina while there.