Im not sure if its out on the PSN market but if it isnt yeah its only JP version. Basically, the stage gives you at least 10-15 levels if you bring Da Ji in your team with S proficiency - her ability doubles the EXP you get. When you complete this stage, you should get around 60k EXP, the amound of KO's you have also affects the points you get, so getting 9999 helps. The stage also gives you a massive amount of gold :P