[1] She was born in Sacramento, California, but moved to Hawaii with her family at the age of nine.

A short novella of the lovers of the Iron Fey series during Valentine's Day was published on Kagawa's website.

The first book of this series is called The Immortal Rules and was published April 24, 2012.

The series has been optioned to become a movie by Joni Sighvatsson of Palomar Pictures.

Kagawa has also opened her own Etsy shop where she sells her miniature clay figurines.