Saki's Younger Brother
Saki's younger brother came to the group asking for their help investigating what his sister was doing at night. He didn't know where she was disappearing to or why she was keeping it secret. Turns out, Saki had been working as a bartender under a fake name and false age to pay for his cram school tuition. It's a pretty rough situation—she was basically sacrificing her own time and risking trouble just to keep him in school.
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