I'm not sure specifically as I haven't read it in detail, but it's likely that there are characters who are sisters, and perhaps other family members or friends who interact with them.
Maybe there is a group of characters where one stands out as the most important in relation to the'sister' concept. They might have distinct personalities, like one being very kind and nurturing, while another could be more rebellious but still deeply connected to the idea of sisterhood within the context of the fanfic.
I'm not entirely sure without reading it in detail, but likely the sister is one of the main characters. And there's probably a male protagonist who has a special relationship with the sister.
It's mainly about the story centered around the characters in relation to the concept of a sister. Maybe it involves the relationship, the experiences they share, and how that relationship impacts their lives.
The translation of 'A Sister's All You Need' is quite good. It manages to capture the tone and style of the original work, although some cultural references might be a bit tricky to translate perfectly.
Well, 'A Sister's All You Need' light novel has interesting storylines, relatable characters, and a world that draws you in. It offers a refreshing take on various elements and leaves you wanting more.