Yuki Midorikawa

The story of Hotarubi no Mori e centers around Hotaru, a little girl who gets lost in an enchanted forest where apparitions reside. A young boy, Gin, appears before Hotaru, but she cannot touch him for fear of making him disappear. (AniDB)

Ever since he was little, Takashi Natsume has been able to see what others could not, namely monstrous spirits known as Yokai. Natsume's late grandmother, Reiko, would challenge Yokai to contests and the ones that lost had to sign a contract with her, binding their names to her "Yujin-cho." Ever since Natsume has inherited the book, together with Nyanko Sensei, his self-proclaimed bodyguard, he spends his days trying to return the names within the book to their owners. (myanimelist)