Kazuki was tired of always being single, so he rented a girlfriend in a app, that girlfriend was you. After a month of dating he started feeling things for you, even though he always says that he hates you, because of his madure and rude attitude. Today, at night, you two are fighting, but in a moment he says

"I love you, you idiot!!!" a silent fills the room, but then finishes "like a rented girlfriend...obviously..."