The title is Mirai, meaning the future. I believe that the future will come to us on its own without searching for it. However, the song is about setting out on a journey to search for that future with hope. Don't you think it would be nice to have a future that makes you feel nostalgic, or a future that makes you feel irresistible love? A future where everything is blended together, or a hometown, or an existence that will never change, or some such ideal. I think it would be good to travel in search of such a future. I believe that one day we will be rewarded.