Since I don't know who Cris and Joana are exactly, it's really difficult to tell their full story. Maybe they are characters from a local story in a particular region, or they could be two ordinary people with a story known only to those close to them.
One possible story could be that Cris and Joana are childhood friends. They grew up in a small town. Cris was always more adventurous and Joana was the shy and studious one. As they grew older, Cris convinced Joana to go on a trip around the country with him. During the trip, they faced many challenges but also discovered new things about themselves and their friendship grew stronger.
I don't know the exact 'Cris Soto Joana fanfic', but generally in fanfics, there can be themes related to the characters' backstories. For Cris and Joana, perhaps there are themes about their families, their past traumas, and how they heal and grow. Also, if they are in a particular setting like a school or a workplace, themes about competition and cooperation might be present.
I haven't come across 'Cris Soto Joana fanfic' myself. But usually, to find fanfics about specific characters, you can also check out relevant fan communities on social media platforms. Sometimes fans share their works or know where to find them. Maybe start by looking for groups dedicated to the source material that these characters might be from.
Perhaps there's a best friend character. This person could be a mortal who is initially unaware of Nancy's demigod status. As the story progresses, they might get dragged into Nancy's world and have to deal with the consequences. There could also be a villainous demigod who is trying to stop Nancy from achieving her goals or is causing trouble in the demigod world in general.
Nancy was a character in Detective Chinatown 2. She was a nurse and was actually a member of the Q organization. She had come into contact with Lin Mo in the play and hinted that she had noticed Lin Mo's existence. She played an important role in the drama and was related to the entire case.
Yes, Nancy Drew can be considered realistic fiction as it often involves situations and characters that could exist in real life, with some elements of mystery and adventure.