Recently, her nipples have become strangely sensitive... Mako, a young wife, is confused by the fact that her body has become sensitive to even the slightest stimulation. Unable to talk to her husband about it, she is left feeling frustrated by it, until her son-in-law witnesses her masturbating to calm his sexual desire. Seeing this as a godsend, Mako asks for advice. And, confused as he is, Mako begins to direct her sexual desire towards her son-in-law, who is concerned about her body...