Innocent and pure little sister Nonoka has discovered the taste of her big brother's cock and is becoming increasingly curious about sex. With her adorable, twitching cute expressions and a flirtatiously cute, anime-like voice, she mischievously tempts her brother into arousal. Every morning upon waking, he finds Nonoka already on the bed, playing with his cock. She suddenly starts licking his face and sucking his fingers, marking his entire body with saliva as if declaring, "Big brother belongs to me!" This blissful daily routine of indulging in incest with his affection-seeking little sister repeats itself over and over again.