[2] High-school girl Anise Yamamoto is a normal teenager, save for a mysterious rose choker around her neck gifted to her by her father Schwartz, claiming that it was a protective amulet and if she ever took it off a "punishment" would be granted.

Anise is named the Rose Princess, the master of these knights, who are revealed to be her schoolmates Kaede Higa, Mutsuki Kuruma, Mitsuru Tenjō, and Seiran Asagi.

Wrecked with jealousy and love for Anise, he informs Schwartz about her loss of the choker and the recent turn of events, causing the former to immediately return home.

The reason is later shown to be Schwartz's doing, and his aim is to destroy the Devil's Seal and unleash it, whilst the choker was designed to prevent Anise's identity as the Rose Princess from showing.

Returning to high school life with each of the boys, Anise no longer wears the rose choker, but wields the cards proudly and develops a romantic attraction to Kaede.