A teenage brother is consumed daily by lewd fantasies and obsessed with masturbation. Everything that carries a woman's scent becomes a trigger for him, and despite being siblings, uncontrollable desire wells up inside toward his sister. His mind is stirred by her cosmetics, scattered clothes, and especially by her underwear wafting a feminine fragrance. One day, his sister accidentally discovers him secretly pleasuring himself. The atmosphere instantly grows tense, and he is overwhelmed by both shame and temptation.