She was a middle school teacher who caught Sakaguchi's attention—and apparently held it for a while, given that he seemed to be a fixture at the school for longer than your typical student. Things took a turn when Sakaguchi, drunk and making poor decisions, dragged her into whatever mess got him arrested. The whole thing tanked her reputation at the school, which is pretty rough considering she was just trying to do her job. But instead of pressing charges or writing him off entirely, she actually forgave him and relocated back to Tokyo. Despite everything—his recklessness, the arrest, the damage to her career—she still sees potential in him somehow.
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