The young lady of the Kanzaki family is actually a "girl boss" feared by all.
Instead of attending the prestigious Rakuzan, she insists on going to the neighboring school to become its big sister.
Then one day, honoring their parents' wishes, the Akashi and Kanzaki families decide to arrange an engagement.
Akashi Seijuro's reason for refusing the marriage alliance is simple. Kanzaki Chikawa feels the same way, and the notoriously arrogant young lady simply stands him up.
Just as expected, Akashi walks out of the hotel, only to unexpectedly spot the girl boss from the neighboring school whom he'd run into repeatedly before. The delinquent-looking girl seems to have just finished a "fight." She's filthy from head to toe, but she takes a deep breath outside the door, flashes a super-sweet smile, and opens the very door he just came through.
So it was her.
The following year, Mr. Kanzaki could no longer put up with the headache. He used the engagement as leverage and forced her to transfer to Rakuzan.
Kanzaki Chikawa thought it over and decided to accept it for the sake of her future.
But why was her deskmate looking at her so strangely?
Why did his gaze make her so nervous every time?
The girl boss, who was used to throwing her weight around, finally chickened out.
"I'm telling you, that Akashi is terrifying." One day, a young lady was complaining to her friend about all the things her deskmate did wrong. "Whoever ends up being his wife is going to be so unlucky, right?"
"Huh?" Her friend suddenly snapped out of it. "Isn't Akashi your fiance?"
Theme: A showdown between a fake demon king and the real demon king.
