Since I'm not familiar with the 'nalacharitham 4th day story', it's hard to say exactly. It might involve characters going through certain challenges or experiences on the fourth day in the context of whatever world or situation 'nalacharitham' describes. Maybe it has themes of growth, discovery, or conflict.
I'm not sure specifically what the 'nalacharitham 3rd day story' is about as it's not a widely known common story to me. It could be a very specific regional, cultural or personal story.
I'm not sure specifically what the 'nalacharitham second day story' is about as it could be a very specific or regional story. It might be about the events, characters or experiences that occur on the second day within the context of 'nalacharitham' which could be a fictional world, a cultural narrative or something else entirely.
I don't have enough information to determine the main characters in the 'nalacharitham second day story'. It could be anyone from a brave warrior to a simple villager depending on the nature of the story.
The 'decameron 10th day 10th story' likely has its own unique themes and characters. It might be about love, as many of the Decameron stories are. It could also deal with moral lessons or social situations of the time. Without reading it specifically, it's hard to give a more detailed analysis.
One possible story could be about a student who has been counting down to the 100th day. On that day, the class has a special project where they make things out of 100 items. This student decides to make a necklace out of 100 beads. They spend the whole day working on it, sharing stories with classmates about how they got the beads and what they plan to do with the necklace after. It's a simple yet fun story that captures the essence of the 100th day in 4th grade.