His subsequent studio album called "9.5 Carats" is a blockbuster that features "Isso Serenade" and his own renditions of above mentioned hit singles. The album mainly consists of his compositions (some of them were co-written by other composers or lyricists such as Tamaki, Yumi Matsutoya, and Takashi Matsumoto) that he already contributed for other performers including Kenji Sawada, Yutaka Mizutani and Inoue's spouse Seri Ishikawa. It topped the Oricon chart and became one of the most commercially successful LP in Japan during 1985. He carried out the concert with Anzen Chitai again, and also released a single "Natsu no Owari no Harmony" (written and sung by Inoue and Tamaki) together. Their concert held at Jingu Stadium was aired on TV, and later its live recordings were released as the album and the video.