Natsume Yuujinchou Roku’s (Natsume Book of Friends Roku, Season 6) first OVA preview was recently released by Aniplex. The sixth season aired during the Spring 2017 anime season. Titled “Suzunaru no Kirikabu” (The Ringing Bell’s Stump), the OVA will be released with the fourth Blu-Ray and DVD for the anime series on September 27.
(The original video is region-locked to Japan)
In the OVA, Natsume and Nyanko-sensei have left the house to go shopping, but they find an elderly man collapsed on the sidewalk, and help him get back home. The man, who turns out to be a yōkai, lives in a gingko tree attached to a Shinto shrine, but the tree was struck by lightning a few days earlier. Natsume hears the yōkai’s story, and learns that his return to the Earth is close at hand. However, the yōkai had made a promise with a certain human long ago, but he has since forgotten the promise.
The fifth season of the series titled Natsume Yuujinchou Go was Anime Trending’s Anime of the Year for the 2016 anime season.
— アニメ夏目友人帳公式 (@NatsumeYujincho) September 7, 2017