Having been married for a few years, the relationship between Miki and her husband gradually became cold. Life just drifted by in a dull, tasteless manner. But someone brought color into Miki's life. Aoi is a colleague at Miki's part-time workplace. Seeing that she seemed troubled, he invited Miki to have a drink together. Feeling a bit tipsy, Miki shared everything with Aoi, who paid attention and learned that Miki was feeling very lonely. In fact, Aoi had been liking Miki for a long time. He transferred to this department just to work with her. Seeing Miki so lonely, Aoi wanted to fill the void in her heart. And thus, their secret relationship began. At first, Miki resisted, but as she felt the affection Aoi had for her, she gradually accepted him more and became more active in their sexual relationship...