1boy, 1girl, air bubble, blue hair, blue skirt, blush, braid, brother and sister, bubble, closed eyes, face-to-face, from side, hug, interlocked fingers, light purple hair, looking at another, neckerchief, own hands together, parted lips, profile, sailor collar, school uniform, serafuku, shirt, short hair, siblings, skirt, smile, underwater, upper body, white background, white shirt, yellow eyes, yellow neckerchief