Series by 緑川ゆき

A six-year-old girl loses her way in a mountain forest near her grandfather's home. A masked being named Gin leads her out and warns that a human touch would make him vanish. She returns to the forest during her summer visits and spends more time with him each year. Their meetings unfold among spirits and quiet seasonal days away from town. As she grows older, her bond with Gin deepens while the rule that keeps them apart never changes.