Brilliance of the Moon is the third novel in Lian Hearn's popular Tales of the Otori trilogy, published in 2004. It describes the events during the months following Takeo and Kaede's marriage at the end of the second book, Grass for His Pillow, leading to Takeo's confrontation with the warlord Arai Daiichi. A period of about 8 months is covered, from Spring to the onset of Winter.