fate (series), fate/grand order, fate/extra, fate/extella, rojiura satsuki: chapter heroine sanctuary, artoria pendragon, mysterious heroine x, cross (crossryou), simple background, white background, 1girl, ahoge, ass, baseball cap, blonde, blue eyes, blue hat, blue headwear, blue swimsuit, competition swimsuit, cowboy shot, female, from behind, hair through headwear, hat, long hair, looking at viewer, one-piece swimsuit, ponytail, solo, swimsuit, tied hair