Manners, Sensibility, and the Romantic Brain

Events at a certain academy in a certain kingdom of a certain world. The prince of this country had a beautiful fiancée. The relationship between the two, who had spent time together since childhood and walked side by side toward the future, began to change after entering the academy. A story about a fiancée who supports a prince whose heart has changed after meeting a certain baron's daughter, as she points out the difference in their social standings.