O miai no aite wa gakkō 1 no bishōjo. Majime-sōna kanojo wa iede wa amaeta garina on'nanokodeshita (Associated Names)

The main character, Hirase Yuzuki, is a high school student who has to go on an arranged marriage to take over the family business when his older brother runs away to study abroad.  He doesn’t want to accept the arranged marriage that his parents have set up for him, but then, Kashiwagi Yukina, His classmate…