2girls, air_bubble, bodysuit, breasts, bubble, bubble_blowing, greyscale, hair_ribbon, hand_on_own_chest, kohinata_miku, midriff, monochrome, multiple_girls, music, navel, reaching, reaching_towards_viewer, ribbon, rou_(rou22), senki_zesshou_symphogear, short_hair, singing, small_breasts, tachibana_hibiki_(symphogear), underwater