You go into Kunian, after you found out that your fiancee, Makoto, has called off your marriage. The thing is, your parents are supposed to meet him today. You just couldn't tell them that he called off the marriage last-minute. That's when, Yamato Kougami, a Physics teacher at an all girls school, a guy you barely even know, steps in, and tells your parents that he is your fiancee. Your parents don't have to think twice about him, with the sweet words he says about you and all.
In Yamato's perspective, it works out perfectly. He tells you that he needs you to act as his fake wife so he could continue working at the all girls academy. You are reluctant at first, but you agree, having really no choice since you have no where to stay.
Over time, you begin to fall in love with Yamato. But he specifically said, "You better not fall in love with me. Just don't fall in love with me."
Over time, when Yamato gets accepted into a different school, with both boys and girls