NIS America announced that they will be releasing a Standard Edition for the 4th Season of Natsume's Book of Friends. Due to release in North America on May 5th, 2015, this standard edition will include all 13 episodes on 2 DVDs and 2 Blu-ray discs.
The legacy of Natsume continues as he spends his days with his grandmother's Book of Friends. Returning the names of yokai to their rightful owners. As he learns to deal with the yokai and humans that surround his life, he also comes to grips with something even more trying-his own life, past and future.
The Natsume's Book of Friends Season 4 Standard Edition is available for pre-order at select online retailers including Right Stuf, The Anime Corner Store, Anime Pavilion, Collectors Anime, and NIS America Online Store.
Source: NIS America