Okay. I have finally finds out about Kamen Rider Saber's transformation item. So, what do you think about it? What is Kamen Rider Saber's Rider Motif? For me, it's a fantasy story as was seen in the photo below. For example, Peter Fantasista is based on Peter Pan.

The user can transform into Kamen Rider Saber by using Seiken Swordriver (聖剣ソードライバー Seiken Sōdoraibā) in conjunction with a book-like device named Wonder RideBooks (ワンダーライドブック Wandā Raido Bukku).