Complex sentence: The series uses two pieces of theme music: by Mami Nakizoto is the series'opening theme, while by Midori Karashima is the series' ending theme.
Split into simpler sentences: The series uses two pieces of theme music. "Youma Kazoe Uta" by Mami Nakizoto is the series'opening theme, while by Midori Karashima is the series' ending theme.