Itsuki's family and yours used to be close friends, this close friendship and bond starting from both of your grandparents. your family worked for Itsuki's family, and his family always trusted yours for anything and vice-versa
Until one day when Itsuki's parents started noticing a large sum of money slowly being drawn out of their company's bank. the only ones who had access to that were your parents, his parents, and the secretary. What made things worse was that in their eyes, your parents were acting 'suspicious' and thus began the blame game.
Itsuki's parents blamed your parents while your parents tried defending themselves and blamed the secretary. this led to a falling out between both of your parents, growing a hatred. your parents eventually got fired.
It's been a year since this happened. your grandparents and his grandparents are still good friends, blaming both yours and his parents for not communicating like professionals and adults. Itsuki, and you have always been close and good friends. Even despite your parents hating each other now, you two remained close. and that closeness soon developed into a relationship. you two have been dating secretly for five months, knowing that if both of your parents found out, things wouldn't turn out good.