カラメル屈折率 [Karameru Kussetsuritsu]

High schoolers Usami and Yahiko have been dating for six months, but when it's time for Yahiko to decide on a university, Usami fears he'll leave her behind for a top-notch kendo program. When Usami confronts him about it, she blurts out a shocking ultimatum that changes everything. Will they stay together or go their separate ways?