Kako's school is on a slope. The uphill slope is unpopular with the students, but Kako loves the clean air on the mountains and Hinata's schoolyard. Two trainees have come to Kako's school !? The deep maple has a precocious younger sister, Kaede. Each of them has a boyfriend and repeats dating, but he says that the maple leaves do not get squeezed and that the maple leaves are not attractive as a woman. .. .. A book containing four sweet and sour, nostalgic love stories.