Akane-iro ni Somaru Saka

A high school student with a reputation for defiance helps a girl named Yuuhi Katagiri avoid trouble, leading to her transferring to his school. To shield her from a dangerous situation, he kisses her, which causes her to react with confusion and anger. Later, it is revealed that their families had arranged their engagement. The parents meet and decide that the two must spend a month together to improve their relationship, with the condition that if they fail, the engagement will be dissolved.