Let's Not Call Off the Engagement at the Graduation Party ~ All the Groundwork Was Wasted

This is the graduation ceremony party venue of an aristocratic academy. The one who turns around after being called is Sandra, the Duke's daughter. She is the fiancée of this country's crown prince. She smiles softly and turns to face Crown Prince Kenneth, who is beside her, and Baroness Helen, who is being escorted by Kenneth. "I've decided to break off my engagement with you, and instead make Helen my new fiancée." "...What...?" "I'm sorry. But I can't let Helen go...!" "I'm sorry, Lady Sandra! But I...!!" "...This is ruined..." ""Huh?"" ※This has no connection to the previous work. Please think of it as an omnibus that just happens to share the same main title.