Figure 17: Tsubasa & Hikaru  

f17, Figure 17, フィギュア17 つばさ&ヒカル, Figure 17 - Tsubasa and Hikaru

Tsubasa Shiina is a ten-year-old girl who recently relocated to Hokkaido with her father. At school, she tends to be reserved and unfriendly towards her classmates. One evening, while out in the woods near her home, she witnesses a UFO crash. She rushes to the scene and discovers that D.D., the pilot of the spacecraft, is barely conscious. Additionally, there's a Maguar, an alien creature that hatched on D.D.'s ship, present at the site. As the Maguar threatens Tsubasa's life, an alien lifeform fuses with her body to create the Riberus battle armor (Figure 17). The being takes the name Hikaru and becomes identical to Tsubasa. Over time, Tsubasa opens up more to those around her due to the influence of her new sister, Hikaru. However, there are Maguar eggs scattered throughout Hokkaido, requiring their ability to form Figure 17 to eliminate all hatched Maguars until backup from D.D.'s home planet arrives on Earth.