Yuuji's younger sister. Kazuki described her as being a crybaby when she was younger. Now that she has grown up she isn't quite the crybaby she used to be. Now she can be found pelting her older brother with air guns hidden in her teddy bear Seiyuu and her other puppets when her brother is acting vulgar. Though she shots him without a moments hesitation, she does greatly care for her older brother and gets lonely without him (also hinting that she might even have a brother complex). Marie is mortally afraid of cats and insects. She is able to flee bugs yet is nearly paralyzed by the presence of cats, though they are drawn to her.