ai katsuki, beautiful Japanese idol, 17yo, bright smile, cute facial expression, shiny black hair, long eyelashes, sparkly brown eyes, colorful Lolita dress, puffy sleeves, lace trimming, ribbon on chest, white knee-high socks, red Mary Janes, holding a microphone, singing, idol pose, spotlight shining down, Tokyo cityscape background, night sky, bright neon lights, vibrant colors, soft focus, cinematic composition.