Reika married five years ago and became stepmother to an adult stepson, Takashi. Although her marriage is good, she has never been able to connect with the reclusive, unemployed man who is always home. When she begins noticing his intense stare, her discomfort turns to alarm. Then he discovers that her areolas are exceptionally sensitive and toys with them beside her sleeping husband until she orgasms uncontrollably. It does not end there: Takashi keeps pursuing and devouring her day after day, and the sexually frustrated Reika gradually begins to give in.