Ken Yasuda

It is the year 1988. Yamabuki is an eight-year-old little boy growing up in a traditional family where every family member has problems and secrets they try to hide from each other. The father runs a failing construction company and has an intimate relationship with another woman. The mother is struggling with severe depression, as she cannot cope with the death of her youngest child. The grandfather, who used to be a construction engineer, hopes to start building an amusement park, but to no avail. The grandmother runs a small store where she sells items of forged origin. The sister is fed up with the lies of her predecessors and is looking for a way to run away from home. In the midst of all this chaos, Yamabuki has started to find solace in patting an imaginary dog.

A high school girl, Sayaka Kudō was the bottom of the class. After a year, she improved her deviation value from 30 to 70, then passed Keio University that is considered one of the most difficult to enter in Japan.

Set in the year 2020, following her supposed death, a young woman returns as the son of her noble family to precede the family's prestigious company, with a demon at her side to avenge her parent's murder.