Fall 2016, so set your RSS for "この世界の片隅に", "To All The Corners Of The World", or "Kono Sekai no Katasumi ni." Teaser trailer:
You might know this author for Town of Evening Calm.
This was originally planned as a teaser chapter when it was announced that this was being adapted into a movie. However, JManga rips were posted online shortly after. So, unless JManga butchered it, you can read the rest of this series via those rips.
Courtesy of MOY-Moe Scanlations.