Well, he might have some culture shock at first. But over time, they could learn from each other and have crazy escapades. There could also be some misunderstandings that they have to work through to build a strong friendship.
Overall, the Get Backers anime remains faithful to the manga. Some minor tweaks might be there for better visual presentation or pacing, but the core story and characters are intact.
The story of the Priestess comic might revolve around a priestess on a quest to uncover ancient secrets and restore balance to a chaotic world. There could be encounters with mythical creatures and battles against dark forces.