Kendama KROM Book Spike
You now have a Kendama, but want to learn more tricks? The instructional book series from Krom will teach you all the important tricks and explains them through great illustrations, so you can even master the most difficult tricks. The three books are divided into three difficulty levels and are written in english, but still understandable for everyone, since the pictures are self-explanatory.
Spike: Beginner - Medium
Click!: Mixed Levels Creativity