The male and female parent's group are partners of interest, and they have known each other since junior high school.
In junior high school, the female protagonist was not as good as the male protagonist in studies. Sometimes she would be attacked by the male protagonist with venomous words, or she would be lectured by her mother and start to hate the male protagonist.
High school in the same high school.
Just after entering high school, the heroine accidentally heard that her parents wanted her to get engaged to the hero. She looked disdainful, thinking that her parents would see the hero's true face sooner or later, and would definitely give up the idea of the engagement, so she didn't care so much.
During the summer vacation of the freshman year of high school, I heard rumors about the bankruptcy of the male protagonist's parents' group, and felt that the male protagonist had nothing to be afraid of. Moreover, when he started his second year of high school, he saw the male protagonist who suddenly changed his clothes (the earrings were gone, he no longer wore such a cool leather jacket, and he did not follow the trends and coolness, but suddenly started to study quietly. Although the clothes were cool, he was not too flamboyant), so he felt that the rumors might be true, so the female protagonist began to mock the male protagonist from time to time.
(The male protagonist's family did not go bankrupt, but just transferred the industry to develop abroad. The female protagonist's parents did not say much to the female protagonist, and the female protagonist did not know. The male protagonist was too lazy to explain, and was happy to see the female protagonist's expression when she mocked him.)
For example:
"Hey, Shinomiya-san, although your little Money is gone, don't worry~"
"As for me, I'm not the kind of person who adds insult to injury and won't break off the engagement with you... Ha, but my parents may help me make the decision? Don't worry, as long as I'm here, you can enjoy your time in high school."
... A lot of cynicism.
The heroine is a kind of dark-hearted lady who pretends to be a good girl, so these words may sound harmless to the naturally dark male protagonist, but the heroine feels that they are already very cruel.
At this time, the male protagonist will give an innocent smile or fight back, sometimes making the female protagonist speechless.
Concept: Fantasy love