Sasaki's a burned-out middle-aged salesman grinding through the kind of job that'll wear you down—the kind Tayama doesn't hesitate to call a "black company." He's the main character, and honestly, he's just exhausted most of the time. But there's one thing that actually picks him up: going through Yamada's checkout line. She's got this genuinely friendly way about her that makes the whole shopping experience feel less soul-crushing. It's become a real bright spot in his day, which probably says something about how rough his job really is.
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