Metroid.jp is the official Japanese site for the Metroid franchise.
The official site in 2003 featured both Metroid Prime and Metroid Fusion, spun off into their own separate sub-sites. The site hosted interviews with Yasuo Inoue, Tadashi Konan, Yoshio Sakamoto, Kenji Yamamoto and Kensuke Tanabe, Michael Mann, Mark Pacini and Karl Deckard, and Miyuki Miyabe, albeit in Japanese.
In 2004, a website was created for Metroid: Zero Mission, and a second for Metroid Prime 2: Echoes. Both sites featured fan Q&As with Yoshio Sakamoto and the development team behind Echoes, answering fan questions about the Metroid series and the respective game.
At least three sites have doubled as flash games for Prime, Echoes and Corruption.
From 2009-2010, the site featured the Prime trilogy, and did not have Hunters or Pinball. Instead the website featured the New Play Control! Metroid games and Corruption. However, for all three there was a description link telling Samus's tales in each game. Below each link was another link to the game website. Finally, this page featured a teaser for "Another Side Story."
On January 29, 2010, Metroid.jp was updated to feature an image from the Metroid: Other M trailer with the piece of piano music playing. The website later featured a remix of Theme of Samus Aran, Space Warrior, which was arranged by Kuniaki Haishima.