Rule 34 Dev - 1boy black_background blue_hair blue_theme closed_eyes coat glowing glowing_headgear hair_between_eyes headphones heart_(organ) highres kaito_(vocaloid) kaito_(vocaloid3) male_focus mouthpiece nokuhashi open_clothes open_coat open_mouth pectorals shirt short_hair signature tight_clothes tight_shirt upper_body vocaloid|21789203553