Sari teaches at Yuihama Middle School and is 25 years old. She's Machi's older sister, though Machi has a pretty dim view of her—calling her irresponsible and selfish. That said, the students absolutely love her. She goes by "Sari-chan" around school, and it's clear she's genuinely popular with the kids, even if her little sister isn't exactly singing her praises at home.
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