Shirohime Quest

is a Japanese light novel series written by Yusaku Igarashi, with illustrations by miz22 (Cover) and Soto (Inner). The series began publication on November 8, 2014 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
"── I'm Kumamoto Castle. I'm a member of the Kato family based in Higo Province ..."

"I'm the biggest castle princess in the prosperous Kyushu region."

The beautiful girl called herself that way. She seems to have traveled back in time, but for some reason she decided to live in my house. And I will be caught up in the turmoil caused by the castle princesses that appear one after another. After all, Kumamoto Castle is a strong girl, but I can't leave it alone.

This is the story of the days I spend with Kumamoto Castle, which connects me and her, Ginkgo ── the “castle owner” and its “castle princess”.