Set centuries or millenia later than the first book, whose events are now only the substance of legends. There's still plenty of magic and mythology here, but it feels grittier, more historical, and the characters at least start out more down-to-earth. Toko and Oguna are childhood friends who are parted when she gets old enough to assist the shrine maiden and he is sent off to become the "shadow" of Prince Oh-usu, his stand-in in ceremonies and times of danger.
So far both of Ogiwara's male "heroes" -- you can't really call them protagonists, the girls get a lot more attention and agency -- are strangely passive, but I kind of like that. Toko reads as much more vivid and real than Saya; a tomboy and stubborn as hell.