Is a Generation Skipping Trust taxable in JP for the intermediate generation?

5-10 years in Japan on a Spouse Visa, will inherit a US generation skipping trust, of which I am one of three heirs; the second generation has 5 heirs.

Two seemingly simple questions 😉
1) Does Japan consider that this generation skipping trust is fully taxable for me? (seems like it)
2) If is IS taxable, how many heirs are there to divide the asset among for JP tax purposes?

Thanks for all the great information you have all provided here.