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Create a polished anime-style square illustration of 【Hitori Gotoh】, a shy teenage girl with very long straight 【pink】 hair and blue eyes, blushing with a nervous, downcast expression. She stands indoors in a soft pink rehearsal-room or bedroom setting, wearing an oversized 【pink】 zip-up tracksuit jacket with pale sleeve stripes and a black skirt, holding a black single-cut electric guitar with gold hardware, cream binding, humbucker pickups, and a black shoulder strap. Her left hand grips the guitar neck while her right hand is held anxiously near her chest, emphasizing introverted stage fright. The background is a mauve-pink wall with warm sunlight streaming in from the right, casting window-frame shadows and a gentle nostalgic glow. Include exactly 2 wall items on the left: one dark concert poster reading 【STARRY】 with smaller band-list text beneath it, and one small pink sticky note with handwritten Japanese practice text and a tiny doodle. Add subtle hand-drawn star and heart outlines on the wall, soft bokeh dust, delicate cel shading, glossy hair highlights, detailed guitar reflections, and a high-quality modern anime key-visual finish.