1girl black_hair blush cheek_kiss closed_eyes collarbone collared_shirt embarrassed facial_hair hand_on_another's_shoulder heart imminent_kiss jacket kiss labcoat long_hair makise_kurisu messy_hair necktie off_shoulder okabe_rintarou pink_background profile red_hair shirt short_hair simple_background steins;gate stubble sweatdrop upper_body yellow_eyes yugure