Natsume's Book of Friends (Japanese: 夏目友人帳, Hepburn: Natsume Yūjin-chō) is a Japanese manga series by Yuki Midorikawa. It began serialization by Hakusensha in the shōjo manga magazine LaLa DX in 2005, before switching to LaLa in 2008. The chapters have been collected in twenty-eight bound volumes. The series is about Takashi Natsume, an orphaned teenage boy who can see spirits, and one day finds the notebook that his deceased and mysterious grandmother Reiko Natsume used to bind spirits that she defeated under her control. He thus resolves to give back all the names in the notebook, and in the process joins forces with another spirit called Madara whose name is also in the notebook.
Learn more about the show on Wikipedia.