Kikou Sennyo Rouran is a tV short anime that premiered in fall 2002, produced by ZEXCS.

About the production: the story comes from an original script, there are 28 episodes of about 12 minutes and its current status is "finished".

Its main genres are action, fantasy and mecha.

On AniList, Kikou Sennyo Rouran has an average score of 57%, an average score, and appears on 1,006 users' lists.

When the secret occult society, Shiromorishuua, sends a huge monster to attack Tokyo, ASY, a peace-keeping organization in Japan, retaliates with a Gousen (metal faery). ASY's Gousen annihilates the creature after driving it into open ocean. Although successful, a surprise attack follows. A girl, floating in midair and glowing with radiance, strikes with a beam of light. This girl is "Rouran." She knows neither her identity, her origins, nor why whenever she senses the Gousen or Kyoushi (reanimated corpses) she transforms into an avenging angel. As Rouran worries about her mysterious existence, Tetsuya kindly watches over her in Tokyo Arcadia, a settlement of expatriates and dissidents. (Source: AniDB)

Official synopsis from AniList.