The female‑like androids known as marionettes, Lime, Cherry, and Bloodberry, have returned to Otaru. The reformed marionettes from Faust, Tiger, Luchs, and Panther, are dispatched to live with Otaru and his friends, where they will learn what it means to be human. A seventh marionette, Marine, arrives, possessing a mysterious power. All of them are equipped with a special Maiden Circuit that grants marionettes the ability to feel emotions.