The latest issue of Dengeki PlayStation (Vol. 596) includes a demo for The Witch and the Hundred Knight Revival for PlayStation 4.
The demo will let you playthrough the prologue and first chapter of the game.
To obtain a demo code, you can purchase the online version of the magazine from Book Walker when it goes live. The retrieval process should be the same as the Disgaea 5 TGS 2014 demo. If you’d rather not buy the magazine for the demo, it will likely be released later on for free.
The Witch and the Hundred Knight Revival is due out for PlayStation 4 in Japan on September 25.
Thanks, Games Talk.