Uchi no Class ni Yattekita Bishoujo Tenkousei no Shoutai ga, Mukashi Ookiku Nattara Kekkon Shiyou to Yakusoku Shita Osananajimi deshita. (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,…