Ria Yonezawa, Grand Prize Winner of Miss High School Girl Contest 2023, appointed as Ambassador for Joshikousei Lab, a new guideline for Gen Z marketing

Ria Yonezawa, Grand Prize Winner of the 2023 Miss High School Girl Contest, Appointed Ambassador for “High School Girl Lab,” a New Guideline for Gen Z Marketing ​ With t Co., Ltd. Press Release: August 28, 2025 To Members of the Media Ria Yonezawa, Grand Prize Winner of the 2023 Miss High School Girl Contest, Appointed Ambassador for “High School Girl Lab,” a New Guideline for Gen Z Marketing ~Using the authentic voices and influence of Gen Z in marketing, we help companies target the teen and Gen Z markets~ Joshikousei Lab, a marketing research organization specializing in the latest teen trends operated by with t Inc. (Headquarters: Shibuya-ku, Tokyo; President and CEO: Keita Miyagi), is pleased to announce that it has appointed Ria Yonezawa, an influencer with tremendous support from Gen Z, as its new ambassador. Image
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“My product isn’t resonating with Gen Z,” “It’s not generating any buzz on social media,”… Do you have these kinds of challenges? Joshikousei Lab, with its nationwide network of 500 Gen Z members, has found a clear answer to these challenges by welcoming Gen Z tastemaker Ria Yonezawa as its official ambassador. Combining her iconic insights with Joshikousei Lab’s vast collection of real testimonials, we will guide your company’s marketing to success. High School Girl Lab -JK Research Institute- Instagram：https://www.instagram.com/jk_labo_/ TikTok: https://www.tiktok.com/@jk_labo_ ▼The value proposition of “High School Girls Lab” accelerates with the appointment of Ambassador Ria Yonezawa By welcoming Ria Yonezawa as an iconic icon for teens and Gen Z, Joshikousei Lab will further strengthen its value proposition by: ・Overwhelming “persuasive power” and “spreading power” With over 400 million total views on TikTok, this track record proves the accuracy of our insights that capture the hearts of Gen Z. Her communication skills as an ambassador bring tremendous persuasive power and the ability to spread information to the research results and projects developed by Joshikousei Lab. ・A “symbol of insight” that creates “real empathy” Ria Yonezawa’s “life-sized sensibility” is truly a symbol of Gen Z insight. “High School Girls Lab” combines this symbolic perspective with the diverse opinions of 500 people across the country, analyzes them, and “translates” corporate messages into a form that truly resonates with Generation Z. ・Enhanced functionality for “discovering” and “creating” trends By welcoming trendsetter Ria Yonezawa as its icon, Joshikousei Lab not only “discovers” trends, but also strengthens its functionality for “creating” new movements. We’ll propel your products and services to the center of the next generation of youth culture. ▼About Joshikousei Lab “Joshikousei Lab” is a promotional support platform with approximately 500 female high school students nationwide, creating real connections with Generation Z. Current high school girls actually experience a company’s products, services, apps, etc. Based on their impressions and feedback, you can utilize the “real voices” of Gen Z in your marketing strategies. By developing it from multiple angles, including social media,
communication, and insight research, we provide comprehensive support for youth marketing. ≪Examples of Solutions We Can Provide≫ We will propose measures that make the most of the insights our ambassadors have and Joshikousei Lab’s network. – Social media promotional planning that appeals to Generation Z, utilizing the perspective of ambassador Ria Yonezawa – Support for the development and improvement of new products and services, reflecting the real opinions of 500 people nationwide – Proposal of a topical PR campaign featuring ambassador Ria Yonezawa – Roundtable discussions and group interviews with members of the High School Girls Lab on the theme of your company’s products etc… ≪Use Cases≫ – Send individual information about apps and services and request downloads and use. – Offer incentives (rewards or benefits) after use and collect reviews and feedback – Use collected feedback for promotional measures and UI/UX improvements – Plan and develop PR campaigns using influencers etc… ▼About Ria Yonezawa Ria Yonezawa is the grand prize winner of the 2023 Miss High School Girl Contest and an influencer who enjoys tremendous support from Generation Z. ・ Media Activities: She has appeared multiple times on Abema’s romance reality show “I Fell in Love Today,” including the Nha Trang, Hua Hin, and Summer Vacation 2024 editions. Her honest and pure emotional expression has resonated with viewers, making her an idol. ・ Overwhelming influence on social media: She shares her real-life high school life on Instagram and TikTok. Her goofy faces on TikTok have become a hot topic, while her cute Instagram posts showcase her unique charm. With a total of
approximately 412 million TikTok views and 568.9K followers, and over 280,000 followers on Instagram, her influence has a significant impact on shaping trends among Gen Z. ≪Profile≫ ・Date of Birth: May 9, 2007 (18 years old) ・Birthplace: Hokkaido Height: 151cm Major
accomplishments: ・Grand Prix Winner of the “High School Girl Miss Contest 2023” ・Appeared on ABEMA’s “Kyou, Suki ni Narimashita.” Nha Trang Edition, Hua Hin Edition, and Summer Vacation Edition ・Instagram Followers: Approximately 260,000 (as of August 2025)
https://www.instagram.com/yonezawa_ria/ ・TikTok followers:
Approximately 570,000 (as of August 2025)
https://www.tiktok.com/@yonezawa_ria ・Affiliated office: WH@Z Image
URL: https://prcdn.freetls.fastly.net/release_image/137975/29/137975-29-4fa2d7c4280f6fbf6ac50366cfb64084-1125×1500.jpg Ria Yonezawa ◼️Company Profile ・Company Name: with t Co., Ltd. ・Location: 2F Grafio Shibuya, 1-22-2 Shibuya, Shibuya-ku, Tokyo -Representative: President and CEO, Miyagi Keita -Business Activities: Audition business, marketing support business, event business, production business -Official Website: http://with-t.co.jp/ [Inquiries regarding this matter] with t Co., Ltd. Public Relations Officer: Yoshitomi E-mail: yoshitomi@with-t.co.jp