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Fast and easy way to level up (Chapter 12+)
Once you have access to Sotenbori in Chapter 12, you'll unlock the Sotenbori Battle Arena. Grind this out until the enemies are slightly above your level or you almost die. If possible, make it to a checkpoint (unlocks every 5 levels) and go back to the first floor. Restart at the highest checkpoint and repeat this process. The higher the floor, the more money and level & job experience.