Rainy Day Serenade Manga Gets Spinoff Series in November

✍️ What we know so far

Automatic note by LuaCat Games, built from what we know about the coverage (who reported it, how many sites, the story’s history) — not a translation or copy of the source.

This comes from Anime News Network, which does its own reporting — for now, it's the only coverage. It’s release news, so jot down the date, just don’t bet everything on it: these things move around a lot.

Bottom line: Safe to take the main point — it's the fine detail that sometimes shifts later.