Figure 17: Tsubasa & Hikaru

Ten-year-old Tsubasa Shiina moves to Hokkaido to live with her father but has difficulty connecting with her classmates. A nearby UFO crash brings her into contact with a dangerous alien and a lifeform that fuses with her to form the battle armor Figure 17. The lifeform takes the name Hikaru and the appearance of Tsubasa's identical twin.