We are not sure of the release date for マザー. It was released at the box office on 2014-09-27 so we estimate it was released to DVD in December 2014.
Director: Kazuo Umezu
A publishing company is working on a book about Umezu’s life. The lead editor, Sakura, knows that Umezu’s late mother Ichie was very influential to his work. As the investigation continues, bizarre incidents begin occurring one after another. Soon, the grudge of a mother who should be dead sparks mounting fear around Umezu.