yuu (positive-yu), niche (tegami bachi), tegami bachi, oni horns, 1girl, alternate costume, back, bandeau, bare shoulders, bikini, blonde hair, blue eyes, blush, bow, chestnut mouth, female focus, flat chest, from side, hair ribbon, horns, long hair, looking at viewer, looking back, oni, ribbon, simple background, sketch, slit pupils, solo, swept bangs, swimsuit, twintails, upper body, very long hair