Historically, poster girls were used to humanize businesses. In manga and art books, they often represent the "ideal" caretaker of tradition.
"See that steam? It has nowhere to go up but up. That steam has seen the happiest conversations, the smallest whispers, the truest laughs. My grandfather knew that. I know that. A convenience store sells rice balls. A sento sells ibu —transcendent, healing steam." Suzume Mino- The Poster Girl Of A Public Bath W...
The “poster girl” role is a marketing tradition in Japan where a relatable, approachable face is used on flyers, billboards, and social media to invite locals and tourists to experience a particular onsen or public bath. Historically, poster girls were used to humanize businesses