Ni No Kuni finally received a sequel in 2018 but the original game is still fondly remembered. Sadly there is no way to play it on modern platforms for now.
Perhaps, one day Bandai Namco will finally port this classic to the modern consoles so everyone can enjoy it.
Source: N4G PC Ni No Kuni for PS3 Emulated at 4K on PC Makes Us Demand a Remaster for Modern Platforms