Figure 17: Tsubasa & Hikaru is a tV series anime that premiered in spring 2001, produced by OLM.

About the production: the story comes from an original script, there are 13 episodes of about 47 minutes and its current status is "finished".

Its main genres are sci-fi and slice of life, with themes such as Clone, Aliens, Found Family and School.

On AniList, Figure 17: Tsubasa & Hikaru has an average score of 71%, a good score, and appears on 5,401 users' lists.

Tsubasa Shiina is a 10-year-old girl who recently moved to Hokkaido to live with her father. In school, she is very quiet and unsociable with her classmates. Then one night, she witnesses a UFO crash in the forest near her home. She rushes to the scene and finds the pilot, codenamed "D.D.", in a barely stable condition. Also in the scene is a Maguar, a hideous alien that hatched aboard D.D.'s ship. As the Maguar is close to taking Tsubasa's life, an alien lifeform fuses with her body to form the Riberus battle armor Figure 17, which shortly destroys the alien threat. The life form takes the name Hikaru and turns into an identical twin of Tsubasa. As time passes, Tsubasa becomes more open to everyone around her, thanks to her new twin sister Hikaru. However, with Maguar eggs scattered all over Hokkaido, their ability to form Figure 17 is needed to eliminate all hatched Maguars until backup from D.D.'s home planet arrives on Earth. (Source: Anime News Network)

Official synopsis from AniList.