Since I ng+'d, I carried over his skills and spells (including skill usage). No exp or gald increasing effects, and I didn't increase my inventory size. No world map glitching allowed. All bosses must be fought on Hard mode.
...I already beat Arietta 1. God, I forgot how broken most skills were. At level 17 (I haven't needed to grind) I have more than enough HP and TP thanks to the random increase in HP/ TP skill.