Sony announced the April PlayStation Plus lineup for Japan which includes The Guided Fate Paradox from Nippon Ichi Software. This roguelike is a spiritual sequel to Z.H.P. Unlosing Ranger Vs. Darkdeath Evilman and prequel to The Awakened Fate Ultimatum which came out in North America recently.
Monster Bag, a PlayStation Vita puzzle game where you solve 18 levels to cause the apocalypse from Iguanabee is a free play game along with Never Alone (Kisima Ingitchuna) for PS4. While Sony has not announced the PlayStation Plus line up in other territories we will probably see Never Alone as a free game in North America and Europe too. Release dates may differ in Japan, but usually indie games for PlayStation Plus are distributed worldwide. Japan is just catching up on Rogue Legacy and OlliOlli 2 which were available in the West this month.
PlayStation Plus members in Japan also get additional content for the PlayStation Vita game High School DxD New Fight and the Celestial Host class for Disgaea 5.
OlliOlli 2: Welcome to Olliwood (Cross buy with Vita)
Rogue Legacy (Cross buy with PS3 and Vita)
Valiant Hearts: The Great War
The Guided Fate Paradox
How to Survive: Storm Warning Edition (PS4)
Shiren the Wanderer 5 Plus (Vita)