Yuuta's Friend
About
She is friends with Yuuta and Eri. After Dead Mother Explosion is aired at the school festival, she criticizes the ending but expresses understanding about the rest, as her own mother had passed a year before.
At the end, she questions Yuuta over the decisions to alter Eri's real-life persona, whom she describes as "self-absorbed", for the second movie.
Of course, her characterization and opinion of Eri are open to the reader's interpretation, regarding how much of it is real and how much is part of a movie.