I'm not entirely sure as I haven't read it specifically. But generally, a visual novel often has a story with characters, plotlines, and various interactions. It might be about the relationships and adventures of students ('doukyuusei' means classmates in Japanese) in a school setting, with different choices leading to different story branches.
One possible unique feature could be its focus on the relationships among classmates. It may have a complex web of interactions that are not commonly found in other visual novels. For example, it could have a deep exploration of friendship dynamics, like how a group of classmates support or betray each other. Also, the visual elements might be designed in a way that really brings out the school atmosphere, with detailed classrooms and uniforms.
One popular title could be 'Clannad'. It has elements of osananajimi relationships. The story involves characters who have known each other from a young age and their relationships develop in complex and heartwarming ways throughout the game.
It's a type of visual novel often centered around the concept of childhood friends. Usually, it tells a story where the relationship between characters who were friends since childhood develops in various ways, such as into a romantic relationship or a complex friendship with new challenges.
Since I don't have first - hand knowledge of 'osananajimi ni najimitai light novel', it's hard to say precisely. However, 'osananajimi' means childhood friend and 'najimitai' can be translated as 'want to become familiar with'. So it may tell a story of a character who wants to become more intimate with their childhood friend, maybe through shared experiences, adventures or just spending more time together in their daily lives. There could be obstacles in the way, like misunderstandings or the intrusion of other characters.
Well, one special thing could be its plot. Maybe it has a unique take on the relationship between childhood friends. It might explore the idea of not wanting to change that relationship in a really interesting way.
One possible theme could be friendship, given the mention of 'osananajimi' which means childhood friends. Another theme might be nature, as 'takane no hana' refers to a flower on a high place.
The 'takane no hana to osananajimi visual novel' could potentially be a story centered around a flower on a high peak ('takane no hana') and childhood friends ('osananajimi'). Maybe the flower has some sort of symbolic meaning related to their friendship. It could be a story of how their relationship evolves over time, with the flower being a constant reminder of their shared past or a goal they are both striving towards.
All I know is that it's a light novel. It might have themes of friendship, loyalty, and perhaps some kind of internal or external conflict related to the concept of not wanting to change the relationship between childhood friends.
One special thing could be its unique character relationships. In many light novels, the relationships between the main character, his girlfriend and his childhood friend often create complex and interesting storylines.