I don't know the '340 days side stories' well enough to name the main characters. But usually in a story, the main characters are the ones driving the plot forward, so they could be the ones facing the most significant challenges or having the most growth during the 340 days.
Since I don't know the exact content of '340 days side stories', it's hard to say precisely. However, it might include things like daily life experiences of the characters during those 340 days. It could be about their joys, sorrows, and how they face different challenges. For example, they could be dealing with family issues, work - related problems, or making new friends.
It's likely about the side stories related to 'nijiiro days'. Maybe it delves deeper into the characters' backstories, their relationships that weren't fully explored in the main story, or events that happened off - the - main - plot. For example, it could show more about the characters' daily lives, their hobbies, and how they interact with each other in different situations.
Since it's side stories related to 'nijiiro days', the main characters could be those boys who are the focus in the original. They might be the ones with different personalities, like the more outgoing one, the shy one, etc. These characters' stories in the side stories could show different aspects of their personalities and how they interact with each other in new situations.
I'm not sure specifically as I don't know which 'read 340 days side story' you are referring to. It could be about a character's journey over 340 days, or some events that happened on the side during a 340 - day period.
I'm not sure specifically as I haven't read it. It could be about various things like the adventures of the characters during 340 days, or it might be a side plot that runs parallel to the main manga storyline for that period of time.
If the 'read 340 days side story' is about a reading - related experience, perhaps 'The Little Prince' could be considered in a way. It's a story that can be read and re - read, and each reading can be like a new journey, much like how over 340 days of reading in the other story could have had different experiences each day. Also, it has a lot of deeper meanings and side interpretations that could be somewhat similar to what a side story might offer.
I'm not entirely sure without reading it, but they might be related to the main characters from 'Rainbow Days'. It could be friends, family members, or even characters who had minor roles in the original but get more spotlight in the side story.
It could be about various things. Maybe it's about the side adventures or experiences of the characters from 'Rainbow Days'. It might focus on their relationships in more depth, or explore some events that are not covered in the main story.
Typically, in a side story of a known series like 'nijiiro days', we can expect the main characters from the original to be present. So it might be those characters who were central to the main plot, such as the friends who had various relationships and adventures in the main 'nijiiro days' story. But again, without having read the side story, this is just speculation.