I'm not entirely sure as I haven't read it specifically. But generally, it might be about the duties or tasks that students have to do after school in a fictional setting. It could involve things like club activities, part - time jobs, or special projects that they take on during their after - school hours.
I'm not sure specifically as there could be many different 'duty after school' stories. It might be about a student's responsibilities or tasks they have to do after school, like helping with cleaning the classroom, participating in club activities, or doing volunteer work.
The main characters in the 'duty after school novel' might include a student who is passionate about a particular after - school activity like painting or sports. There could also be a teacher who is guiding and mentoring the students in their after - school duties. And there might be a character who is new to the school and these after - school duties are their way of fitting in and getting to know the other students and the school culture better.
The plot of 'A Sisters Duty' manhwa centers around the lives of sisters as they navigate various situations. The main themes could involve love, sacrifice, and the importance of sisterhood. There's a lot of emotional depth and character development.
You might start by looking at bestseller lists in the genre related to the manhwa. Or, check out novels by authors who have a similar writing style or approach to storytelling as the manhwa creator. Another idea is to browse reviews on book websites to find novels that match your preferences based on the manhwa.