what I forgot to mention is the fight has a huge change, it happened inside the building, because its a suneragi house it has a lot of secret passages so Erika ends in the same situation when she was hiding in the closet. She ends trapped in fake wall and hear Harold speech, the web novel made it more passionate because even the brother got flustered. After hearing that She falls in love with him (for real) but at the same time she doubts about herself, she thinks she is not good enough to be at his side in terms of politics, feelings and power so starts her own training arc and joins the Hero party (the dude that is with the first girl Harold saved at the beginning of the story).
Eventually she meets the science girl from the past arc, they talk about Harold and Erika is being BTFO by her.