During the One Year War, Mirai served as the pilot of White Base. She was the navigational officer and was very calm about things. She always had conversations with Bright, and became a very important member of the crew. She is also part of the rich and famous Yashima Family.

After the One Year War, Mirai marries Bright and has two kids, Hathaway and Cheimin. They move to Hong Kong to escape the war between the Titans and the AEUG, but eventually meet Amuro and Kamille. They retreat from Hong Kong after an attack by the Titans.

Mirai was able to survive the war between the Titans and AEUG and still waits for her husband Bright to return from battle.