Anca is the first romance option you'll encounter in The Blood of Dawnwalker because she's the only one who appears in the prologue before Coen ever becomes a Dawnwalker. That said, you do have a lot to do in a short amount of time before the first Blood Mass, so there is a chance you miss her altogether if you never bother trying to get medicine for your mother.
If you do visit her, however, you'll have an opportunity to make the most of this encounter and begin planting the seeds for a future romance. From there, you'll need to nurture your relationship with Anca, and if you do, you'll unlock her romance scene soon enough.
Before you even get the chance to meet Anca, your siblings will tease you for having a crush on her, which is a bit of a clue to the fact that she might be a romanceable option for Coen, and one he's already smitten with.
To reach Anca's romance scene, which is the peak of her and Coen's relationship, you'll need to complete several quests tied directly to her. Some of them will also help you advance to the main objective of defeating Brencis. However, they're primarily there to share Anca's backstory and gradually build up the relationship between the two characters.
The first of these quests begins in the prologue, and the rest can be completed at your discretion, though you may need to wait until you've leveled up, as most of her quests will involve fights with tough enemies.
Aside from intentionally rejecting Anca, the only way to ensure the romance doesn't happen is if you visit her while hungry and accidentally kill her. Otherwise, as long as you do the quests and encourage flirting, the romance scene should be more or less guaranteed.
As mentioned, Anca's first encounter is during the prologue. When you go to retrieve medicine for your mother, you'll find Anca kneeling by the river behind her house. Approach her to explain why you're there, and then head inside the house to grab the medicine. She'll mention an upcharge, but you can counter at the usual price, which she'll understand.
Anca's prologue scene can eat up a lot of your time before the Blood Mass, so ensure this is what you want to do.
سەرچاوەی فەرمی بە زمانی ئینگلیزی: https://www.thegamer.com/the-blood-of-dawnwalker-how-to-romance-anca-unlock-scene-guide/
