At the beginning, when it first started, there weren't that many. It's the first adult visual novel (AVN) that elicited an emotion from me (the chapter where Dee leaves her father; at that time, we didn't have the continuation, it was a real departure). It hasn't really replicated that for me with others (yes, but I won't give names here). This is due to the fact that the characters are very well written! They have a real psychology of their own, and the immersion and attachment to them are strong. The models are top-notch, but it's especially the text that undergoes serious work, with an MC (main character) full of common sense. It's these subtle differences that quickly elevated it into the top 10 and then the top 5 as the chapters unfolded. Over the years and with time, it has earned a special place. I also consider the author and their works. Melody or Sunshine Love is just below but is also very good. It's the combination of these stories that makes it clear that, no, there aren't that many similar authors.