The Cat Left Behind

Yuki-Onna was Japanese. The only reason for her to be in Wisdom Spring is that her mother, Minako, had died mysteriously in their old home in Kumamoto and nobody there would talk to her family anymore, because they feared that Minako is a witch.
And she most certainly is.
In other parts of the world, two like cases occured, and three families moved to Wisdom Spring, not knowing their stories are the same.
The kids became friends.
They went on a journey to save the world.
And Yuki-Onna's cat was left behind.