2girls, assault rifle, black dress, black hair, clothes around waist, detached sleeves, dress, epiphyllum, flower, from behind, full moon, gloves, green hair, gun, holding, holding gun, holding weapon, jacket, jacket around waist, long hair, m4 carbine, moon, mountainous horizon, multicolored hair, multiple girls, nature, night, night sky, official alternate costume, outdoors, particle cannon case, petals, ribbed sweater, rifle, showdown, sky, sleeveless, sleeveless sweater, standing, star sky, starry sky, streaked hair, sweater, weapon, white flower