Are there any romance novels where the main characters are childhood friends who eventually get together?

Yes, the 'childhood friends' trope is a very popular element in romance novels, and it often leads to heartwarming and satisfying relationships. This trope allows for a deep established bond, shared history, and a natural progression from friendship to romance. In novels featuring this trope, readers often get to see the characters grow up together, supporting each other through various life events, which can make their eventual romantic union feel earned and deeply meaningful. The anticipation of them finally realizing their feelings for each other is a significant part of the appeal.

While I don't have specific titles in my current database that exclusively focus on this trope as the primary descriptor, the novel "Since I’ve Entered the World of Romantic Comedy Manga, I’ll Do My Best to Make the Heroine Who Doesn’t Stick With the Hero Happy" has 'Childhood friends' listed as one of its tags. This suggests that this dynamic might play a role in the story, even if the main plot revolves around the protagonist entering a manga world. It's worth exploring such novels where this tag is present, as it often signifies a significant relationship element.