Natsume's Book of Friends, Vol. 12, 12

Takashi Natsume can see the spirits and demons that hide from the rest of humanity. He has always been set apart from other people because of his gift, drifting from relative to relative, never fitting in. Now he's a troubled high school student who has come to live in the small town where his grandmother grew up. And there he discovers that he has inherited more than just the Sight from the mysterious Reiko.

Natsume meets a kindhearted yokai who has found a ruined letter he desperately needs to read. There is another yokai who has power over paper who might be able to help him. But this yokai's name is sealed in the Book of Friends... Will it be willing to help the grandson of the woman who bound it?!