Series by 緑川ゆき

Takashi is a high school student who can see spirits and demons hidden from other people. His ability has isolated him and sent him from one relative's home to another. In the town where his grandmother grew up, he inherits a magic book filled with names of spirits she once bound. Those spirits begin seeking him out because they want their names returned. He starts facing supernatural ties left by his grandmother while trying to keep a place among ordinary people.

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.