After being widowed for many years, my mother suddenly decided to remarry. Ryuguu Byakuya was surprised, but wholeheartedly supported her decision.
Only...
"You must be Yuriko's son. Hello, I'm Yamabuki Takuto, and this is my daughter, Yamabuki Kazusa."
"I forgot to mention, we're both fox spirits."
"!!!!"
What do I do if my mother's new husband and my stepsister are fox spirits? Asking online, this is... wait, I'm a yokai too, just a half-half-half-half-yokai (one-sixteenth yokai blood)?
Oh, then it's all good. _(:з"∠)_
This book is also titled "Master of Japanese Yokai."