Is Hiruma Yoshino considered to be a lasting effect on the character in the province?
If so, the lasting effect will cease if the character enters play (Charge), the discard pile (Sabotage), or deck (Peasant's Advice). (As per In Play and Out of Play.)
Are the four provinces considered separate Out-of-play areas?
Asahina Takako is able to move characters around.
If the provinces are one area, can Takako move the chosen character to a different province, and it still contributes its skill?