１枚目はプリンセスチュチュコスです。
静かに寄り添って　どこにもいかないで　（君の銀の庭より）

The first page [tn: refers to the pixiv pages for multiple illustrations] is Princess Tutu.
Cuddle with me gently, and don't go anywhere (From "Your Silver Garden" [tn: ED for the Rebellion movie])