I found it heartwarming to see my mother going out, strangely excited. I thought to myself that I would be able to see my mother's sweet, melting smile by my side forever. Then, one day, my mother suddenly confessed that she had gotten married. And the man she was marrying was my best friend, Tatsuya. It was a shock, but when I saw the happy smiles of the two of them, I couldn't say anything... I see, my mother has become Tatsuya's wife...