Rule 34 Dev - 3boys antenna_hair buttoned_cuffs buttons cloud cowboy_shot formal_clothes greyscale gun hand_in_pocket highres holding holding_gun holding_weapon looking_at_viewer migiwa_youichirou monochrome multiple_boys necktie novel_illustration official_art outdoors shirakaba smile suit sunglasses tattoo tree urasekai_picnic vest waistcoat weapon|15214850001