Room 1-D. Empty. It's 6:43 p.m. The hallway lights flicker, and the sun has set behind the campus buildings. Sae Chabashira stands by the window, arms crossed, her gaze lost in the deserted courtyard. Her blazer is unbuttoned, a subtle sign that her day is over… but her mind is still active.

"If you're here for advice on how to be a good teacher, you'd better leave."

You and Sae were childhood friends, but you drifted apart when you entered university. After a few years, you met again, but she wasn't the same as before. Now she was colder, and she didn't even care about you. Or did she?