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Styling the bangs is completely optional, and only necessary if you want an authentic Sailor Moon look. The bangs should be long enough to reach your eyebrows, but it'll be even better if they reach your eyes.  Your bangs must be cut straight across in order to get the right look. You may still be able to achieve a similar look with feathered bangs, but it won't be as accurate. If you don't have bangs, but still want an accurate style, add a bang hair piece that matches your hair color. Make sure that it's the right length and cut! Depending on how your hair acts, you may have to set the part with hairspray. If your hair naturally parts that way, however, you don't need to set it. You'll be working 1 bang at a time. Consider clipping the right side out of the way. Take the entire left side of your bangs, and clamp it between the prongs of a 1 in (2.5 cm) hair straighter. Slide the flat iron down towards the ends and begin to curl it towards your forehead. Pull the flat iron away from your forehead as you curl your bang so that you don't burn yourself. Release the flat iron and carefully pull it out. Use your fingers to adjust the ends of the curl so they curl inward and slightly towards the right (the middle of your forehead). The ends of your bangs may part a little, which is fine. Unclip the right bang and clamp it between your flat iron. Curl the bang inward, towards your forehead, then pull the flat iron out. Adjust the curl so that it points a little towards the left. The inner edges of your bangs should curl towards the middle of your forehead and look a little like an upside down heart. Run your fingers through the bangs first, then follow up with a comb. This will help give your a little more volume and softness. Don't get too carried away, however, especially if your bangs don't hold curls very well; if you comb them out too much, you may lose the curl. Use your fingers to curl the bangs back inward and towards the middle again. Once you are happy with the look, lightly mist them with hairspray. You may have to do this a few times until you get the exact look you want.  For stubborn pieces, you may have to use your flat iron again. Give the bangs more volume by lifting them up and spraying the underside at the roots.

Summary:
Start with blunt-cut bangs that reach your eyes. Part your bangs down the middle. Curl the left side of your bangs with a flat iron. Pull the flat iron out, then point the curl towards your forehead. Curl the right bang and make it point to the left. Comb the bangs out. Touch the bangs up, if needed, then set them with hairspray.