Futaba Ida is the younger sister of Kazumi Ida. After a fight with her brother he accidentally turned her into a magician and she then joined Wizard Brace
Nothing is really known about her past other than she was once save by Takeshi Nanase from an older man with bad intentions. From this encounter her brother became friends with Takeshi.
Besides flashbacks and pictures Futaba did not appear for most of the story. At the start of the main characters second year she enrolls at the Elementary School section of Subaru Magic Academy. Her brother then reveals that over Spring Break he accidentally made her a magician, while causing an explosion in their home.