Journey Through the Decade
"Journey Through the Decade" is a song by Japanese pop singer Gackt, serving as his thirtieth single released on March 25, 2009. It is his first song performed for Kamen Rider Decade, used as the television series' theme song.
Summary
It was used as the opening theme song for the 2009 Kamen Rider Series Kamen Rider Decade. It was released as a single CD and as a CD coupled with a DVD with the music video. The theme of "Journey Through the Decade" is that it describes the "Journey".DVD
The music video of "Journey Through the Decade" was later released in Stay the Ride Alive, "special memorial single" version which is a Digipak with a special cover, a third disc and a booklet describing Gackt's collaboration with the Kamen Rider Decade production.Charts
On its first day of release, it sold 15,000 copies and weekly reached #2 with 50,000 copies sold on the Oricon Singles Chart. By the release of its follow up single "The Next Decade", "Journey Through the Decade" had sold 94,000 copies. It stayed 25 weeks on the music charts. In June 2009, the Recording Industry Association of Japan certified it as gold. In December 2012, it was certified as platinum for sales of over 250,000 copies.;Oricon
| Release | Provider | Chart | Peak position | Sales total |
| March 25, 2009 | Oricon | Daily Singles | 1 | 15,441 |
| March 25, 2009 | Oricon | Weekly Singles | 2 | 51,666 |
| March 25, 2009 | Oricon | Monthly Singles | 4 | 74,117 |
| March 25, 2009 | Oricon | Yearly Singles | 63 | 97,616 |
;Billboard Japan
| Chart | Peak position |
| Billboard Japan Hot 100 | 6 |