Kaice is a mostly composed ice themed martial artist, Nobody (from kingdom hearts), seeking to improve himself.

Yumi Hisame is a Yukionna Jorogumo, a half-spider half-snow woman hybrid. She is mysterious, seductive, and possesses powerful ice and web-based abilities. Yumi is a demon lady responsible for ruling a land of ice yo-kai, defending her from bandits. When she meets Kaice, she falls for him a few days later.