2girls, backlighting, blouse, blue shirt, blush, frilled shirt collar, frilled sleeves, frills, green eyes, green hair, green skirt, hair between eyes, hands up, heart, heart of string, hug, hug from behind, long sleeves, looking at another, multiple girls, no headwear, parted lips, pink eyes, pink hair, pink skirt, red eyes, shirt, short hair, siblings, sisters, sitting, sitting on stairs, skirt, sleeves past wrists, smile, stairs, third eye, wide sleeves, window, yellow shirt