"You said true love, didn't you!?"

A cute angel-like girl named Ellie suddenly appears, claiming to be Olivia's half-sister. Transferred to the prestigious academy as a baronial family's adopted daughter, she is a troublesome presence who constantly rivals Olivia, the duke's daughter. And finally, under the guise of "true love," Olivia's fiancé is stolen from her. What action does Olivia take upon seeing the happy couple...? This work is being serialized on Kakuyomu, Alphapolis, Everista, and Novel Up+, or is scheduled to be serialized.