うちのクラスにやってきた美少女転校生の正体が、昔大きくなったら結婚しようと約束した幼馴染でした。 (Associated Names)

As a second year high school student, I, Kotaro Yagami, was planning to spend my days as normal as ever. But that day, a new student arrived in my class, and that new student was my childhood friend, Tsukishima Yui, whom I prommised to marry a long time ago. It was when we were kids,…