"Aa Ii na!" (あぁ いいな!) is the second single of the J-pop duo, W. It was released on August 4, 2004, under the Zetima label. This was the first single that W released after their graduation from Morning Musume. It is the highest selling single of all of the W singles. This song was used the last ending theme of the Doraemon 1979 anime.