"7" is a song recorded by Japanese singer Shizuka Kudo for her eleventh studio album, Doing. It was released by Pony Canyon as the album's lead single on November 20, 1995. The song was the ending theme to the AX variety show TV Oja Mammoth, while the single's B-side, "Hachigatsu..." was featured on the AX tanpatsu drama Ren'ai Zenya: Ichido Dake (1996), on which Kudo appeared in a supporting role. "7" is the first in a consecutive trilogy of singles with one-character titles: "7" is followed by "Chō" and "Yū".