Saito and Akane are classmates in high school and for some reason, they can’t stand each other.
Akane, in particular, doesn’t hesitate to tease Saito whenever she gets the chance, and he doesn’t keep quiet and continues the fight.
Himari, one of their classmates, has a different perspective on their relationship and doesn’t hesitate to tell Akane that maybe they behave like this because they like each other.
One day, Saito receives a call from his eccentric grandfather, who is the head of a successful industrial conglomerate.
Although Saito would rather avoid it, his grandfather orders him to meet him for lunch, and even sends his personal driver.
Upon arriving at the place, he receives an unpleasant surprise, Akane is in the same restaurant and tells him that her grandmother has invited her to lunch.
Minutes later, Saito’s grandfather arrives accompanied by Akane’s grandmother, and during the meal, they begin to tell their personal story.
It turns out that they had a romance in their youth, but ended up distancing themselves for decades. Now, both widowed, have decide to have fun.
But although they are happy, they deeply regret having lost so many years.
Thinking of their grandchildren, both order them to consider becoming a couple, marry and experience the life that they could not in their youth.
The young couple immediately oppose, but Saito’s grandfather is clear, if he wants to inherit the family business, he will have to do what he orders.
On her side, Akane’s grandmother is discrete, and says something to the girl in her ear, which immediately makes her think in silence.
After three days, both accept the conditions of their marriage, but it will not be easy for them.
(クラスの大嫌いな女子と結婚することになった.)
