PS Vita title has sold half a million units in Japan.
The game’s setting is inspired by various historical periods of Japan, and tells the tale of humanity’s last stand for survival.
Monstrous demons known as Oni invaded the world through cracks in space and time and started attacking humans. A secret group called the Slayers has protected humity, and now eight years after the Oni first appeared, a brave young Slayer embarks on a journey to save mankind.
Source: EU PlayStation Blog