let me tell you—it's a rabbit hole! From what I've pieced together, the 'Spring' series isn't just one linear story but a sprawling universe with spin-offs, alternate timelines, and even crossover novellas. The core series has about 12 books, but if you count the side stories and anthology contributions, we're looking at closer to 20. Some fans argue about what 'counts,' though. Like, there's 'Spring: Eternal Blossom,' which was originally a web novel but got a print adaptation—does that make it #13 or just a bonus? The publisher's website lists 15 'official' entries, but indie translations and fan projects muddy the waters. My personal shelf has 18 titles I consider canon-adjacent, including the prequel 'Spring Origins,' which fleshes out the lore in wild ways.
The fandom wikis are chaos because some regions got exclusive releases. Japan has two light novels that never made it overseas, and there's a mobile game tie-in with its own lore book. If you're a completionist, brace yourself—tracking down every variant cover and limited edition is a grind. I once spent three months hunting for a signed copy of 'Spring: Requiem' at cons. Worth it, though. The series' worldbuilding is insane; every book adds layers to the mythology, even the shorter ones.