@depressedkot Just like it's mentioned above, her name is "Anna Kanou" (not "Jushichiya").
Also that dialogue box reads "カノウアンナ中三ッス! (Kanou An'na Chūsanssu!)".
With "Chūsanssu" meaning "3rd Year Junior High School" (and as per Japan, "Junior High School" = "Middle School").
Basically "カノウアンナ中三ッス!" simply translates to "Anna Kanou, 3rd Year Junior High!"
She is not Freshman High School, yet (she is supposed to be one year junior to MC who is 1st Year High School).