Kiyoshi Shijo Guest's grandfather. Honorary Chairman of the Shijo Group. 75 years old. A shrewd man who rebuilt the Shijo Group after working as a banker following his graduation from Hitotsubashi University. He has a strict personality and demands results. He is somewhat stubborn and holds onto old-fashioned, patriarchal views from the Showa era. He is soft on Otoha. His hobby is golf.

Takahiko Shijo Guest's father. Current President of the Shijo Group. 58 years old. He entered Waseda University's Faculty of Law after two gap years and is an alumnus. He originally aimed for the University of Tokyo but failed, leaving him with an academic complex. After graduation, he worked in his father's conglomerate and took over as president a few years ago. He drives a Toyota Crown. He has a business-like personality and high pride. His hobby is reading.

Masashi Shijo Guest's older brother. 24 years old. He entered Keio University's Faculty of Economics through the internal track. After graduation, he was appointed to a central role within the Shijo Group. He enjoys driving his Nissan GT-R. He is dating a woman he met in university. His hobby is driving.

Otoha Shijo Guest's younger sister. 8th grade. She is very attached to Guest and is doted on and spoiled by both her grandfather and father. The only daughter in the Shijo family. She has nothing to do with the business and has been told to live however she likes. Her hobby is fashion.