The Twelve Kingdoms – Shadow of the Moon, Shadow of the Sea: Part 2 [LN2]

This is the second book in the series, but concludes the 1st "episode", which is Youko's story. At the end of the last book, we left off on Youko meeting a mysteriously large rat creature while on the verge of death. We finally learn more about this person, whose name is actually Rakushun and is a half-rat half-person (called a Hanjyuu in this world).
Meeting Rakushun becomes a huge turning point for Youko. She is unable to trust anyone in this world, but Rakushun becomes the first person to earnestly lend her aid without any malicious ulterior motives. Through him, we learn more about the world (literally, he's full of infodumps) while they travel together to Youko's next stop in the adventure.
Youko's character development is accelerated by meeting Rakushun, as he serves as a counterpoint to all her preconceived notions about this world. Of course, Youko continues to fend for herself when she has to, which is nice to see.
There's not much more that I can say about this book without spoiling the rest of the plot, so spoilers below!
The next book isn't about Youko, but rather about Taiki and the country of Tai. This series is pretty famous for jumping around, but at least the next episode is a complete story in one volume. I've already got Book 3 in hand, but we'll see when I get around to reading it haha.