Not to be confused with Sana Futaba
- Age: Unknown
- Eye colour: Unknown
- Hair colour: Unknown
- Japanese pronoun: Unknown
- School: Uknown
Not much is known about her personality as she only appears in two flashbacks, but she was particularly close to Mio as they were best friends.
Not much is known about her history prior to her death. All that is known about her is that she was a member of Lina's group in Kazamino City for a time and befriended Mio. Her group had crossed paths with Sasa Yuuki several times in attempt to stop her and her Witches. One of these encounters lead to her death and her friend Mio seeking to avenge her.
Futaba in Sadness Prayer
Futaba was only shown in two flashbacks as a former member of Lina's group in Kazamino. The group had several encounters with Sasa Yuuki, one in which lead to her getting killed. Out of all the members of the group, her best friend Mio hated Sasa the most and sought her out in an attempt to avenge her death, but fails when she is killed by Kirika.
She was last shown in Mai Akane's flashback together with the others.
- Her last name is unknown, same as Mio.