Sawamura Reiko's first lesbian film is finally here! On the surface, Yumi and Reiko are colleagues at work, but in reality they are lovers. Yumi has always relied on Reiko, who is always there to encourage her, and swears that she will never leave her no matter what, but the breakup comes suddenly. Reiko breaks up with her. Yumi is unable to accept Reiko's sudden change of heart, and begins to investigate everything she can find around her in an attempt to find out the truth. And finally, she discovers the truth...