Red Leaves' is a hauntingly beautiful novel I stumbled upon years ago, and it left such an impression that I immediately scoured the internet for any follow-ups. From what I gathered, it stands alone—no direct sequels or spin-offs exist. The author, Kakine, seems to have moved on to other projects, which is a shame because the melancholic atmosphere and psychological depth of that story still linger in my mind. That said, fans of its vibe might enjoy 'Another' by Yukito Ayatsuji—it hits some of the same eerie, mystery-heavy notes with a school setting and unresolved past tragedies.
I did find a few forum threads where people mistook similarly titled works, like 'Red Data Girl,' as connected, but they're entirely separate. There's also a Chinese manhua called 'Red Leaves' that occasionally causes confusion, though it's unrelated. Sometimes, I wish Kakine would revisit this world, but maybe the ambiguity is part of its charm. The ending leaves just enough unanswered to keep me theorizing late at night.