Since I don't know the 'spring day story' specifically, I can't say who the main characters are. They could be ordinary people living in a small town, or perhaps they are animals that come out during spring.
I'm not sure as I haven't read it. But it could have a young protagonist who is experiencing the end of spring in a special way. Maybe there's an older mentor - like figure who guides the protagonist during this time.
Typically in a visual novel, the main characters could be young adults. They might be students or young people starting out in their careers. For example, there could be a male lead who is an artist trying to find his place in the world and a female lead who is a writer. But this is just speculation without knowing the actual content of 'the last day of spring 2 visual novel'.
I don't know who the main characters are as I don't have details about the'spring kids story'. They could be a group of young friends.
Perhaps the main characters are the visitors to the hot spring. They could be tourists from all over the world, each with their own reasons for coming to the hot spring. Some might be there for the health benefits, some for the novelty, and others just to have a unique experience. It's also possible that there are local characters who are regulars at the hot spring and play important roles in the story, like an old man who has been coming to the hot spring for decades and shares his wisdom with the other visitors.
Since I don't know the specific 'Spring Time Story', I can't say who the main characters are. They could be ordinary people, like a gardener who tends to his spring flowers, or perhaps some magical creatures that are only active during spring.
I don't know as I haven't read it. It could be a young girl who loves spring.
The main characters in 'Spring Awakening Story' usually include a group of young people. They are at an age where they are starting to question everything around them. There may be a male and a female lead among them who experience a deep connection on an emotional and physical level. And of course, there are likely to be other supporting characters such as friends, siblings, or adults in their lives who influence their development in different ways.
I don't know the 'day 9 story', so I can't tell who the main characters are.
There might be an older character as well. Maybe an older person who has seen many springs and can offer wisdom based on their experiences of past springs. And perhaps there's a nature - loving character who is really attuned to the changes that spring brings.
There could be astronauts as the main characters. They are the ones directly experiencing the new spring on Mars.