+++, 3girls, arm behind back, black skirt, blue eyes, blush, book, brown eyes, brown hair, dress shirt, frown, grey hair, grey shirt, holding, holding book, kuromorimine school uniform, laughing, long sleeves, looking at another, medium hair, miniskirt, multiple girls, open mouth, outline, pleated skirt, pointing, school uniform, shirt, short hair, siblings, sigh, simple background, sisters, skirt, sleeves rolled up, smile, standing, sweatdrop, white outline, wing collar