釘宮理恵
Each season has two pieces of theme music: an opening theme and a closing theme. All opening themes are performed by Ichiko while all closing themes are performed by Rie Kugimiya, Louise's Japanese voice actress. Season one's episodes opened with "First Kiss" and ended with . Season two episodes started with "I Say Yes" and ended with , and season three episodes started with "You're the One" and ended with "Gomen" (literally "Sorry"). Season four episodes started with "I'll Be There For You" and ended with "Kiss Shite Agenai"