A non-traditional start in Tokyo, orphaned at a young age and relying on his mother and sister for support. However, this is no ordinary Tokyo! His cat is actually a cat-youkai, and his parents are officially certified Onmyoji. It seems to be a standard plot of a high school student saving the world. This book is also known as "My Family's Yin-Yang Art Doesn't Need Shikigami", "High School Students Should Still Save the World".