A French essayist travels to rural Japan in search of a mythical herb that has been heard to alleviate human pain, embarking on a journey of cultural discovery and transcendence with a mountain guardian who lives in an ancient forest. She meets Tomo, a guardian who lives among the cedar trees, and together they navigate the complexities of their respective worlds, forging an unlikely bond that crosses language barriers. As Jeanne delves deeper into her research, she begins to unravel the secrets of this elusive plant, Vision, and the lives of those around her are forever changed by its presence.