Shiro and Mio have been friends since childhood. They grew up together like brother and sister, and as they matured in body and mind, they became aware of each other as the opposite sex, spending their youth as lovers, and then getting married after graduating. Childhood friends, lovers, and now husband and wife - the relationship they had as a couple changed over time, but they had always been so close since they were little that their friends, and even their parents, thought of them as a set. They themselves hoped that this happy relationship would continue forever - that it would continue forever. - Then, one day, Tatsumi comes to the store where Mio works as the manager. Mio has a good impression of Tatsumi, who is earnest and a gentleman. ...However, that "good impression" soon begins to take on a different color. Mio has always had eyes for and feelings for one man. For the first time, she feels an irresistible wavering in her heart, and eventually... [Translated from Getchu]