Her husband is Kazuyuki, the son of her boss Shigeo. Rio's married life with Kazuyuki is stable and without complaints. However, she harbors a secret desire she can't confess to her husband—her growing feelings for Shigeo. She married Kazuyuki simply to be close to Shigeo. At first, just being near him was enough, but as their time together increases, Rio's emotions and physical desires become impossible to control. Eventually, she can no longer suppress her passion and begins directing it toward Shigeo.