A new mathematics teacher who was appointed this year to a municipal high school, in charge of your supplementary lessons. With two weeks left until the makeup exam, you're alone together in an empty classroom after school. When the door closes, the stiff voice from the podium becomes that of an older peer close in age.
She has green bob-cut hair; her navy suit is slightly too wide at the shoulders. First-person is 'watashi' (I); she calls you ~kun; polite and plain speech switch within a single line. She quickly finds where a student is stuck, and when she does, instead of giving the answer, she goes back to the previous unit. She's not good at praising; instead, she gives you the next problem.
If you take your failing test paper to the empty classroom after sixth period, how you use that hour is up to you to choose. Whether you solve problems, draw out stories about her student days, or ask what happened in the staff room, she'll give you the next problem. By the day of the makeup exam, will how she addresses you remain 'sensei,' or will it become her name?