So exciting! Have you played the first campaign or are you going to experience it for the first time?
In a kinda not-comprehensive way: Journal/journaling RPGs are basically the idea of writing a journal of the character you're roleplaying as. :D
Often times, you make a character, and the game randomizes what situations they find themselves in. Many Journaling RPGs are solo affairs as well. (Seeds of Renewal is about exploring a solarpunk world and writing about your character's experiences with the communities, ecosystems, and technology they encounter.) :D
A really famous journaling RPG is Thousand Year Old Vampire, where you roleplay as (you guessed it) a Thousand Year Old Vampire and journal about what happens to them over time. :D
If you want to see this format in action, I'd recommend this Shut Up & Sit Down review. They do a great job showing what makes journal RPGs fun and interesting! :D
Saw this go by on itch.io!
I'm always in the mood for more tabletop solarpunk experiences, and a journal RPG sounds like the perfect thing to tide me over until Earthborne Rangers: Legacy of the Ancestors comes out.
I backed the original kickstarter. I play it once a week with my partner and our friend. Absolutely fantastic game. I know the creators have said that they don't consider their work solarpunk, but man this setting has so much in common with the solarpunk movement. Anyone into Solarpunk/RPG type games I think will adore it.
Oh my gosh I am so excited for you/your group. You are going to have a great time!