Magical Girl weapons are things that can be used without restriction. No matter how many times you shoot, arrows will continue to pop out of your quiver. No matter how many times you eat, sunflower seeds will continue to be refreshed endlessly. No matter how many times you throw, your kunai will never run out. Ripple’s kunai and shuriken were those kinds of items. No matter how many times she threw them, there was no indication that she’d run out.