Hi! No worries, the setting is a supplement for Troika, which since you have the bundle, you already have! https://melsonian-arts-council.itch.io/troika-numinous-edition
There's no introductory material in the document since it assumes a certain amount of context. Lemon Grove is written in a similar style to Troika's backgrounds, implying the setting from descriptions. I hope that makes some more sense though.
Thanks for checking it out!