I just forgot about its existence.

On the day of the academy's graduation party, Aileen Ursula, the Marquis's daughter, was suddenly called by name and told, "I'm breaking off our engagement!!" Standing beside him was a voluptuous baron's daughter. However, this was news to Aileen... "We already dissolved the engagement two years ago, though?" "Huh?" This is the story of a young lady whose fiancé had completely forgotten she even existed.