"Niji/Himawari/Sore ga Subete sa" (虹/ひまわり/それがすべてさ) is the eighteenth single by Japanese artist
Masaharu Fukuyama. It was released on 27 August 2003. This single sold around 356,600 copies in its first week. It remained at the number 1 position on the
Oricon chart for 5 consecutive weeks,[1][2][3][4][5][6] breaking the artist record of four consecutive week from his 1994 single "It's Only Love". Niji was used as the theme song for
Fuji Television drama Water Boys and Water Boys 2. "Himawari", written by himself, was originally released as a single sung by
Kiyoshi Maekawa in 2002.