Miyajima started her career with conforming work on Japanese film production at IMAGICA in 2009. After 2014, she was engaged in several coordination work for post-production on films and drama productions, including grading, editing, audio post-production, and arranging staff schedules. She has worked on the films Princess Toyotomi, Wild 7, OVER DRIVE, the Netflix film Zom 100: Bucket List of the Dead, the Netflix series Alice in Borderland, Yu Yu Hakusho, and many others. Joined THE SEVEN in April 2024.