No, you don't need a perm. You'll just need longer hair, a lot of dread wax (like from KnottyBoy), and a lot of backcombing and twisting. If your hair is a typical Asian hairtype (bone-straight, slick, coarse), then you'll want to put small braids in your damp hair the night before. That way it will give your hair some texture before you start dreading.
How long is that samurai look? Count on between 30-50% shrinkage when you dread your hair, so you'll want to grow your hair longer than you want the dreads to be.
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