NEXON in 2015 released in Korea and North America, Europe the HIT smartphone action RPG game. The game at the moment is not available in Japan with Japanese translation but NEXON going to change it soon.
The official teaser website of the Japanese version HIT already opened which going to be available from November 10, 2016. HIT is a high-end smartphone game which is using Unreal Engine 4 and still very popular not just in South Korea.
We sure it will be a huge success in Japan also.