Just use the Momo's reminder from Maiden. To do that you just switch to Maiden and click Momo's reminder in the left corner above skill and then click on S tips. From there you just have to use what's on it for the princess 7-8.
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Use the Nikki Guide app in the android store!
7-5: Momo's tips were enough for me. It might be useful to have the hyacinth top and brown pleated skirt bottom, as well as over level 4/5 in smile/charming/critical eye. You gain levels based on the difference in score between you and the bot, not your total score.
7-8: The swordgirl set is a must. But, you don't need the whole thing -- usually, just top + bottom is enough for these kinds of levels. Textiles leggings + Ranger shirt (unevolved version of top) with the appropriate accessories (see app!) and skill levels is enough for an S in princess.
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Good warning. Additional warning for you, I'm just a little ahead of you at 7-8, and you need the Top and Bottom of the Cloud-Sword Girl set to pass.
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