crystal maiden (series), artist request, bad source, game cg, highres, official art, third-party source, 1girl, armor, ass, blue eyes, boots, breasts, from behind, full body, helen (crystal maidens), holding, holding sword, holding weapon, knee armor, kneeling, looking at viewer, looking back, panties, pink hair, red scarf, scarf, short hair, shoulder armor, sideboob, solo, sword, transparent background, underwear, weapon