One night, Katie is shown with Guiche, who is flirting with her. Based from their conversation, Katie brings Guiche some soufflé.
The Plebeian Familiar Spirit
Katie goes to see Guiche to bring him some handmade soufflé after Saito Hiraga helps point her to where Guiche is. She goes to him and informs him of the soufflé that she had promised him the previous night, making Montmorency de Montmorency suspicious of Guiche. To further the "misunderstanding", Saito gradually exposes Guiche's two-timing; Katie, together with Montmorency, calls Guiche a liar as his girlfriend slaps him, leaving him humiliated in front of the other students.