English Title: Guardian of the Dream. I read Ainikki's fan translation of this book, immediately after "The Wanderer". Note: though The Wanderer was released as book #11, it is a prequel story, and works well as an interquel between books 2 &3.
The plot of this book centers around a flower that is blooming in the world of souls. This flower blooms once every 50 years, at which point it must leave its seed in the soul of someone. When it gets close to blooming, it begins calling potential souls. The souls become trapped in a dream, while the person's body is in a coma-like state. The book follows the efforts of Tanda, Torogai, and Shuga in figuring out how to call people's souls back. Meanwhile, Balsa is guarding a traveling singer whose song seems to be linked to this process, and Chagum is chafing trying to adjust to becoming the crown prince.
The framing of this story is weaker than the first 2 books. We never really understand how the flower effects the real world, or why it is important that it blooms. If that piece had been included, I think the book would have benefitted greatly from it. Where this book excels though is in the character work. Guardian of the Darkness was essentially a Balsa solo story. This story, Guardian of the Dream, includes all of the characters from the original novel, and furthers their story. This includes minor characters like Jin, Toya, and Saya as well as the main characters. In many ways, this is the true sequel to Guardian of the Spirit, and it pains me that we never got it in English.
The theme of this book is grief, and moving past it. The theme is echoed mostly by Torogai, Balsa, and Chagum. Tanda, as the hero of the story, does not know how to deal with grief. He has too much empathy, and is drawn into sharing others' grief, rather than rising above it. It is for this reason that I love Uehashi's writing. Tanda is far from perfect, and needs people's help to overcome his weaknesses. Balsa is the same way; her weakness is that she loves fighting, but hates hurting people. However, the main reason I love Uehashi is not because the characters have flaws, but because she's not afraid to let those flaws shape and change the characters, leaving them different people by the end of the book. Balsa's development is understated in this novel, but it's an important shift that shows that an eventual happy ending might be possible for her.
In all, I give this book 4 out of 5 stars. The plot is somewhat lacking, but the characters and themes are on point. The fandom for Moribito considers this to be the worst book in the series, so I have no idea what I'm in for from here.