Rock, a robot with a "young man's" appearance, who has thirteen gears inside his body that will change color as they receive a 'heart' or a strong emotions of human being that will make him more human-like. Because the toys are created for human happiness, Rock strives hard to grant people's wishes in exchange for a 'heart' that they could give him.

In the Manga de Opera series: V.1 - **Carmen** by KIZAWA Rumi V.2 - **La Traviata** by Motsuko V.3 - **Madama Butterfly** by KOBAYASHI Kaoru V.4 - **Turandot** by SADAKANE Aiko V.5 - **The Flying Dutchman** by YAMADA Seiko V.6 - **The Marriage of Figaro** by HINODE Eijun V.7 - **The Magic Flute** by Broccoli-ko V.8 - **Aida** by KOBAYASHI Kaoru