On the day of the shoot, the shadow of a man sneaks up on Tsukinoruna-chan, who entered the studio without being told anything. A fully erect man suddenly appears in front of her, who is not yet ready! And then begins the guerrilla SEX! Even in an incomprehensible situation, her body reacts sensitively. Luna-chan, who feels it firmly despite the sudden sex. After that, she is surprised by the men who keep getting erections one after another! Despite being confused, the cute Tsukinoruna enjoys the SEX.