grisaia no kajitsu, suou amane, matsushima michiru, sakaki yumiko, game cg, 16:9 aspect ratio, 3girls, beach, bikini, black hair, blonde, blue eyes, breasts, casual one-piece swimsuit, cleavage, covered navel, hair ornament, hair ribbon, large breasts, light-skinned, long hair, lying, multiple girls, on back, one-piece swimsuit, open mouth, outdoors, purple hair, red bikini, red eyes, ribbon, side-tie bikini, smile, sukumizu, swimsuit, tied hair, twintails