2girls, \||/, anime_coloring, bikini, black_bikini, black_hair, breast_envy, breasts, cleavage, crossover, day, frilled_bikini, frills, gridman_universe, halterneck, head_out_of_frame, inoue_takina, keihh, large_breasts, light_purple_hair, long_hair, lycoris_recoil, multiple_girls, navel, o-ring, o-ring_bikini, o-ring_top, open_mouth, outdoors, panties, pool, poolside, purple_bikini, purple_eyes, shinjou_akane, short_hair, side-tie_panties, sitting, ssss.gridman, strap_gap, swimsuit, underwear, water