100%Kakashi Hiden: Lightning in the Icy Sky / Chapter 1: Kakashi Hiden: Lightning in the Icy Sky (カカシ秘伝 氷天の雷 , Kakashi Hiden — Hyōten no Ikazuchi, Viz: Naruto: Kakashi's Story — Lightning in the Frozen Sky) is an original story written by Akira Higashiyama