A Tale of the Secret Saint ZERO Novel Volume 4 was written by Touya with illustrations by Chibi.

Budding saint Serafina and her friends travel to Starfall Forest in search of the Galle Gold Leaf medicinal herb, but along the way, they stumble onto a surprising sight - Serafina's brothers are under attack by a monster! Although Serafina wants to jump to their aid, something is fishy about the whole thing... And that's only the first surprise, because waiting for them in Galle Village is the shocking truth about the Galle Gold Leaf!