6+girls, aged down, ahoge, bag, black hair, black skirt, blue hair, blunt bangs, blunt ends, bob cut, brown eyes, brown hair, character name, closed eyes, cross hair ornament, dated, hair between eyes, hair ornament, hairclip, hand on another's head, happy birthday, holding hands, interlocked fingers, lap pillow, leaning on person, long hair, long sleeves, low twintails, multicolored hair, multiple girls, neck ribbon, purple hair, red eyes, red ribbon, ribbon, school uniform, shirt, short hair, short twintails, siblings, sisters, sitting, skirt, sleeping, sleeping upright, smile, standing, sunset, suspender skirt, suspenders, time paradox, train interior, twintails, two-tone hair, two side up, white shirt, wing collar