"I was suddenly told my engagement was broken off, but thanks to sharing a room with the Duke's daughter, I'm happy!"

At a graduation ceremony party celebrating the graduation of senior students, Adele is suddenly told by her fiancé that their engagement is broken off. Standing beside her is her younger sister Miriam. Both of their claims are completely unexpected——. As they're at a loss, the Duke's daughter, the First Prince, and even the Duke's legitimate son all appear, and things escalate rapidly.