Yamada Character Guide

Readers first meet Yamada behind the register at Super S, a neighborhood supermarket. With her warm smile and friendly customer service, she seems like an ordinary cashier. But Yamada is anything but ordinary.

She is the female protagonist of Smoking Behind the Supermarket with You—and one of the most uniquely written characters in modern romance manga. What makes her special isn't just her personality. It's the secret she carries.

Yamada and Tayama are the same person.

During work hours, she is Yamada—polite, cheerful, always smiling. After the uniform comes off, she becomes Tayama—relaxed, sarcastic, wearing a choker and leather jacket behind the supermarket. Sasaki, a 45-year-old salaryman, gradually discovers both sides of her.

If you want the full picture, read our Who Is Tayama? character guide alongside this page.

Character Profile

| Category | Details | |----------|---------| | Name | Yamada (山田) | | Off-Work Name | Tayama (田山) | | Series | Smoking Behind the Supermarket with You | | Role | Female Protagonist | | Occupation | Supermarket Cashier at Super S | | Age | 25 | | Started at Super S | 8 years ago (as a part-timer) | | Voice Actor | Seena Hoshiki | | Closest Relationship | Sasaki |

Overview

Yamada works at Super S, the supermarket where Sasaki stops by after long days at the office. To him—and to every customer—she is the friendly cashier with a warm smile.

But Yamada's story is about more than customer service. Her dual identity is the central mystery and emotional engine of the series. During the day, she maintains a polished, professional persona. At night behind the supermarket, she sheds that persona entirely—along with her uniform.

The contrast between Yamada and Tayama isn't just about appearance. It reflects the different ways people show themselves to the world versus who they really are when no one is watching.

To follow Yamada's story from the beginning, check our Smoking Behind the Supermarket with You Chapter List.

Appearance

As Yamada, she wears the standard Super S uniform—neat, clean, and professional. Her hair is tidy, her demeanor approachable. Everything about her appearance says "reliable employee."

But there are hints of who she becomes off the clock. If you look closely, you might notice small details—a certain tiredness behind her smile, or a brief moment where her expression shifts when she thinks no one is looking.

The transformation between Yamada and Tayama is one of the manga's most striking visual elements. To understand the full contrast, see the Tayama character guide for details on her off-work appearance.

Personality

Yamada's work persona is carefully maintained:

Warm and approachable — Every customer feels welcomed
Always smiling — Her cheerful demeanor brightens Sasaki's day
Soft and light-hearted — She never lets the stress of retail show
Patient and kind — Even on long shifts, she treats everyone well
Professional — She keeps her personal life completely separate from work

But this isn't an act—it's a genuine part of who she is, just not the whole picture. The manga slowly reveals that Yamada's kindness comes from real experience and real empathy, not from a desire to please others.

The Yamada-Tayama Duality

This is the heart of Yamada's character, and the central device of the series.

During store hours, Sasaki only knows Yamada—the cashier whose friendly service is the highlight of his day. Then one night, he wanders behind the supermarket for a smoke and meets a woman with a choker, piercings, and a leather jacket. She introduces herself as Tayama.

Sasaki doesn't realize they are the same person.

What follows is a story built around two relationships that are secretly one. Sasaki confides in "Tayama" about his life while continuing to see "Yamada" at the register, never connecting the dots.

This premise allows the manga to explore themes that go deeper than a typical romance:

The gap between public and private self
How we open up to different people in different contexts
Whether someone can fully know another person

The duality is revealed to readers early, making every interaction between Sasaki and Yamada/Tayama layered with dramatic irony.

Relationship with Sasaki

Sasaki, a 45-year-old office worker worn down by corporate life, first notices Yamada simply because she smiles at him—something he rarely experiences in his daily grind.

To Sasaki, Yamada represents comfort. She's the one bright spot in his routine. He doesn't approach her romantically. He just appreciates her presence.

Meanwhile, behind the supermarket, "Tayama" becomes someone he can actually talk to. She listens. She teases him. She makes him feel seen.

The beauty of the setup is that Sasaki is drawn to both versions of the same person—without knowing it. Yamada gives him warmth and kindness. Tayama gives him honesty and real conversation. Together, they are exactly what he needs.

Why Yamada Stands Out

In a genre full of heroines defined by a single personality type, Yamada is different.

She is not "the shy girl" or "the popular girl" or "the tsundere." She contains multitudes—literally. The Yamada/Tayama split isn't a gimmick. It's a genuine exploration of how people compartmentalize their lives, especially in cultures where professional and personal personas are strictly separated.

Many readers see themselves in Yamada. The version of you at work is not the same as the version of you at home with close friends. Yamada simply takes that universal experience and makes it literal.

Interesting Facts

Yamada was created by manga artist Jinushi as a webcomic posted on Twitter in March 2022, before being serialized in Big Gangan
She started working at Super S as a part-timer 8 years before the story begins, meaning she has been there since age 17
Her name switches between Yamada (山田) and Tayama (田山)—the difference is just one swapped kanji
Voice actress Seena Hoshiki performs both sides of the character in the 2026 anime adaptation
According to fan analysis, Yamada harbors deep-seated insecurities about her own worth, making her cheerful work persona both genuine and protective
The manga has been praised for how it handles the dual identity reveal, letting it unfold naturally rather than as a cheap plot twist

Frequently Asked Questions

Who is Yamada in Smoking Behind the Supermarket with You?

Yamada is the female protagonist. She works as a cashier at Super S supermarket, where her friendly service catches the attention of Sasaki, a tired salaryman. She is later revealed to be the same person as Tayama.

Are Yamada and Tayama the same person?

Yes. Yamada is her work identity (polite, cheerful cashier). Tayama is her off-work identity (relaxed, edgy, smoking behind the supermarket). They are the same 25-year-old woman presenting different sides of herself in different contexts.

How old is Yamada?

Yamada is 25 years old. She started working at Super S as a part-timer at age 17. Sasaki, her love interest, is 45—making their age gap 20 years.

Does Yamada have a full name?

In the series, she is known as Yamada (山田) at work and Tayama (田山) after hours. As is common in some manga, a full given name is not prominently used. The naming itself is part of the dual identity premise.

Does Yamada fall in love with Sasaki?

The manga develops their relationship slowly through everyday conversations and shared moments. Yamada's feelings for Sasaki grow across both of her identities—as the cashier who brightens his day and as the woman behind the supermarket he confides in.

Related Character Guides

About This Character Guide

This page is part of our independent Smoking Behind the Supermarket with You Character Wiki. It focuses on Yamada's identity as the supermarket cashier. For her off-work persona, visit the Tayama character guide.

As the manga and anime continue, this guide will be updated with additional details and references.