This, I feel, is one of the strengths of the manga, and what makes it stand out from the rest of the Touhou manga. World-Building is top-notch as per ZUN's previous works, but the story, now delivered in 2-parters, are excellently told and often contain twists and turns, some unexpected, that make for an enjoyable read.
Characters are also very well written here. Main protagonist Kosuzu in particular, may seem like an innocent character who's a bit naive, has depth in her characterization in which she actually comes across as much more manipulative as she may initially seem. Other supporting characters are given as well, series protagonist Reimu, for instance, is given a much more serious portrayal, who very willingly will go through whatever it takes to upheld the law and decency in Gensoukyou, a far cry from her lazy attitude in Wild and Horned Hermit, but still doesn't feel out of character with her attitude across the franchise.
Overall I recommend Forbidden Scrollery to all fans of good material.
