6 -7 ..most of the quest/ sub quest/ options needs basic knowledge in japanese ..you're good to go if you are at lv 3- 5 understanding in japanse..
if this is your first japanese game.then the difficulty is 9/8 --- You decided who you are. Not society. And you're fine exactly the way you are. Your curves, words, flaws, strengths, thoughts. You don't need to change