Members

TOP
MEMBERS

INTRODUCTION

PERSONALITY &
HARMONY

A unique digital marketing team.

ADSQUARE is made up of unique members with a wide range of expertise and knowledge, regardless of nationality.

OUR TEAM

A boutique-style team specialized in each area of expertise

TEAM 01

PERFORMANCE
MARKETING TEAM

Performance
Marketing

Centered on ad operations and data analytics, we design strategies from customer acquisition to LTV improvement and support business growth

TEAM 02

SOCIAL MEDIA
MARKETING TEAM

Social Media
Marketing

Centered on social media management and influencer initiatives, we design strategies from awareness expansion to fan development and support brand growth

TEAM 03

BX TEAM

Centered on brand strategy and customer experience design, we design strategies from brand awareness to improved customer experience and support the enhancement of brand value

TEAM 04

EC CONSULTING TEAM

EC Consulting

Centered on e-commerce strategy and data analytics, we design strategies from marketplace operations to sales growth and support business growth

TEAM 05

ACCOUNT
MANAGEMENT TEAM

Account Management

Centered on client strategy and project execution, we handle everything from issue clarification to strategic implementation and support business growth

MEMBERS

Meet the Members

CEO

MASAHIRO YOKOI
COO / Marketing Head

HONG SUNGBAE
DIGITAL MARKETING MANAGER

SONG JUNGHWAN
CREATIVE DIRECTOR

DAIKI SHIBA
MARKETER

YUKINO FURUTA
MARKETER

CHINATSU ONODERA
SNS MARKETER

AYUKO KAWAHARA
MARKETER / SNS MARKETER

SARA KIN
PLANNER / SNS MARKETER

AIKA
ACCOUNTING / GENERAL AFFAIRS

MASHITAN
BX DESIGNER

AOI HAYAZAKI
MARKETER

KAORI
ACCOUNT EXECUTIVE

JI CHENGYU
MARKETER

TANTON NATASHA
SNS MARKETER

YUI
SNS MARKETER

AYANO
E-COMMERCE CONSULTANT

MIZUE KAWASAKI
DESIGNER

KAZUHIRO YOKOI
WEB DIRECTOR

CHINATSUSAN
WEB DIRECTOR

NICKY

CEO

MASAHIRO YOKOI

JOIN: 2016 JANUARY

FROM: GIFU, JAPAN

LIKES: ANIME / BIKE / SLEEP

Leads web consulting informed by hands-on production, direction, and producing. Brings breadth across design, front- and back-end, marketing, web ads, and CRM. Owns end-to-end project direction and business/promotion architecture; personally drives UI/UX, user-flow and information architecture, and sales copy. Curious by design—believes great work should feel like play.

COO / Marketing Head

HONG SUNGBAE

JOIN: 2020 APRIL

FROM: BUSAN, S.KOREA

LIKES: TRAVEL / POPPING

With over 10 years in digital marketing, currently serving as Executive Officer and Head of Marketing at adsquare, a Japan-based advertising agency. Oversees company-wide operations and team management across all marketing functions. Provides end-to-end support for overseas brands entering the Japanese market — including Clorox, Lotte Card, and Nature Republic — from strategy to execution. Capabilities span SNS advertising, influencer marketing, performance advertising, and creative production, all delivered through an in-house integrated structure. Available in Korean, English, and Japanese.

DIGITAL MARKETING MANAGER

SONG JUNGHWAN

JOIN: 2021 JANUARY

FROM: SEOUL, S.KOREA

LIKES: SALSA DANCING / COOKING / GAMES

Former luxury-cruise crew member and Navy chef; later served on Google Ads Support in customer and technical roles, consulting on digital marketing. Trilingual (KR/EN/JP, JLPT N1). Also a certified barista and licensed rescue diver. Salsa and video games for downtime—Korean home cooking on request.

CREATIVE DIRECTOR

DAIKI SHIBA

JOIN: 2021 MAY

FROM: TOYAMA, JAPAN

LIKES: DTM / CAT / MOVIES

Senior graphic & web designer from an ad-production background. Worked with multinational apparel brands and music labels across media. 15+ years spanning brand strategy, art direction, web direction, and original music/BGM for video. Self-proclaimed ramen purist; currently moonlighting as an aspiring film connoisseur and electronic music composer.

MARKETER

YUKINO FURUTA

JOIN: 2022 MARCH

FROM: AICHI, JAPAN

LIKES: ANIME / CAT / TRAVEL

Agency marketer with 100+ projects for homebuilders, automotive, life-event services, major food brands, and banking. Covers the full stack from marketing planning to hands-on buying, optimization, and training junior marketers. Cat lover—ironically allergic.

MARKETER

CHINATSU ONODERA

JOIN: 2022 DECEMBER

FROM: KANAGAWA, JAPAN

LIKES: DOG / CAFE

From apparel sales and call centers to Google Ads consulting and now performance marketing. #1 in individual retail sales and top team KPIs in ads—trust built on results. Communicator with a bias for action; certified in Search and Display; values agility and fast iteration. Resilient and upbeat; recharges over coffee with the dog. Goal: the go-to when things get tough.

SNS MARKETER

AYUKO KAWAHARA

JOIN: 2023 MARCH

FROM: OSAKA, JAPAN

LIKES: PHOTO / DOG

Social media marketer managing channels and influencer programs. Realized a long-held plan by relocating to Nagano and launching a lodging business; also published a book on homebuilding. Works with a “freedom + speed” mindset—pragmatic and enjoyable. Photography, dogs, and cataloging forest mushrooms are current obsessions. Mother of two, balancing craft and life.

MARKETER / SNS MARKETER

SARA KIN

JOIN: 2024 DECEMBER

FROM: AICHI, JAPAN

LIKES: SOCCER FAN / NAGOYA GRAMPUS

Built broad experience at an importer of Korean cosmetics and K-POP goods—customs clearance, owned e-commerce, customer support, and social channels. Delivered zero shipping delays and standardized inquiry handling; a reliable, service-first problem solver. Focused on bridging Japan with Korea and global markets.

PLANNER / SNS MARKETER

AIKA

JOIN: 2024 DECEMBER

FROM: HYOGO, JAPAN

LIKES: PEOPLE-WATCHING / TREND SPOTTING / YOGA / PILATES / WEIGHT TRAINING / REGATTA / TRAVEL / SOUTHEAST ASIA

Built a cross-border career from an overseas internship to hotel assistant manager, study-abroad agent, and a Korean marketing firm. Brings B2B/B2C sales, social channel operations, influencer marketing, and localization/translation—runs ads tuned to local trends. Known for flexibility and fast response; aims to pair “fun and craft” while building genuinely win-win client relationships as a growing marketing professional.

ACCOUNTING / GENERAL AFFAIRS

MASHITAN

JOIN: 2023 SEPTEMBER

FROM: AICHI, JAPAN

LIKES: MUSIC / COOKING

Former systems engineer with experience from development through maintenance; later moved into sales administration while actively building networks. Today in general affairs, creating an environment where the team can do their best—quiet, detail-minded, and highly empathetic. Enjoys music, cooking, and solo travel (especially home-style food from around the world); moves forward steadily by thinking from the other person’s point of view.

BX DESIGNER

AOI HAYAZAKI

JOIN: 2025 JUNE

FROM: GIFU, JAPAN

LIKES: GRAPHIC DESIGN / ILLUSTRATION / ART / MUSIC / EXPRESSION

Skilled in design with a marketing perspective and improving SNS ads. Focused on clarity and user experience, delivering designs that truly communicate. Grounded, detail-minded, and results-oriented; explores art, music, and new methods to sharpen creativity. At Adsquare, growing as a trusted designer who values both the client’s identity and the viewer’s perspective.

MARKETER

KAORI

JOIN: 2025 SEPTEMBER

FROM: FUKUSHIMA, JAPAN

LIKES: TRAVEL / SEA / MOUNTAINS / NATURE / RELAXATION SKILLS

Experienced across travel, web ads, and local government; now focused on “regional revitalization × marketing.” 10 years in web marketing, skilled at data insights, performance gains, and stakeholder coordination. Loves traveling to nature-rich places. Curious, challenge-driven, and values diversity beyond money or fame.

ACCOUNT EXECUTIVE

JI CHENGYU

JOIN: 2025 SEPTEMBER

FROM: CHINA

LIKES: CROSSFIT / WORKOUT / RUNNING / MUSIC / TRAVEL / MUSEUMS / FASHION / CHALLENGES / MORNING RAVES

Diverse background in IT, real estate/hospitality, and cross-border EC. Boosted profits through EC/IT sales and new client growth; supported global expansion with multilingual SNS, ad localization, and influencer work. Turned around a deficit lodging business and achieved recovery even during COVID-19. Strong in cross-cultural insight, logical thinking, and self-discipline; health-minded and challenge-driven.

MARKETER

TANTON NATASHA

JOIN: 2025 OCTOBER

FROM: AICHI, JAPAN

LIKES: MOVIES / SHRINES / ANIMALS / K-POP / YOUTUBE

Worked as a Japanese teacher in Korea, then in an apparel trading company handling admin and client coordination between Japan and Korea. Managed orders, payments, and documentation. Contributed to new client acquisition through manuals and sales materials. Skilled in data organization and client communication, aiming to grow as a trusted digital marketer with strong analytical and detail-oriented skills.

SNS MARKETER

YUI

JOIN: 2026 MARCH

FROM: KYOTO, JAPAN

LIKES: PHOTOGRAPHY / TRAVEL / FOOD / NATURE / SAUNA / LIVE MUSIC

Born in the UK and raised in Kyoto and Germany, I built my career as a project manager in the gaming and translation industries. I have managed translation projects for artist groups, overseeing the entire process while coordinating with multiple translators. In indie game PR, I was responsible for promotions through communication with influencers, helping to expand awareness. My strengths lie in flexibility, thorough preparation, and smooth project execution. I strive to be a trusted partner who helps bring my clients’ vision and the unique appeal of their products to a wider audience.

SNS MARKETER

AYANO

JOIN: 2026 MARCH

FROM: OSAKA, JAPAN

LIKES: CAFE / SHOPPING / MOVIES / DRAMAS / SOCIAL MEDIA / TRAVEL

Based in Osaka. Specialized in SNS marketing within the aesthetic medicine space—handling content creation across social platforms and YouTube channel management. Analyzed post data and user response to continuously improve content, driving brand awareness and client acquisition. Skilled in target-driven content planning and video marketing; also plans and executes influencer campaigns using Korean language skills. Committed to honoring both the user's and client's perspectives—partnering to make sure value is communicated the right way.

E-COMMERCE CONSULTANT

MIZUE KAWASAKI

JOIN: 2026 MARCH

FROM: TOKYO, JAPAN

LIKES: COSMETICS / CHARACTER GOODS / COLLECTING / GOMOKU / AI

Born in Japan, raised in China. Managed EC operations centered on skincare—covering product page management, campaign planning, and ad operations through to inventory, order processing, and CS. Won the Qoo10 AWARDS 2023 within six months of launching on the platform. Leverages a trilingual (Japanese, Chinese, Korean) background to drive EC projects in close collaboration with cross-functional teams. Committed to growing alongside clients as a true Win-Win partner.

DESIGNER

KAZUHIRO YOKOI

JOIN: 2020 MAY

FROM: AICHI, JAPAN

LIKES: CLAYWORK / MUSIC

Designer with 20+ years across a leading mail-order business and a design studio, covering graphic, web, and editorial. Builds marketing-led concepts and creative that move the needle, supporting clients end to end. Off hours, enjoys crafting quirky art toys and producing music.

WEB DIRECTOR

CHINATSUSAN

JOIN: 2023 NOVEMBER

FROM: AICHI, JAPAN

LIKES: BODY CARE, JAPANESE HOT SPRINGS, KIMONO CULTURE

Spent 23 years as a DTP operator at a printing company, producing brochures for major travel brands; later led a ~30-person team and closed 20–50 jobs a day—strong speed and workflow control. Now supports municipal CMS operations and teaches web accessibility; also a certified kimono instructor. Prefers work that’s clear and pleasant to experience over flashy.

WEB DIRECTOR

NICKY

JOIN: 2020 APRIL

FROM: AICHI, JAPAN

LIKES: FANTASY MOVIES / AQUARIUM / GUINEAPIGS

Web director with hands-on experience across web design, front-end engineering, web marketing, and analytics. Previous roles span chocolatier, café, vintage apparel, and EC operations. Combines deep communication skills honed through years in customer-facing roles with broad web expertise to get to the root of client challenges and solve them.

MEMBERS

PERSONALITY &HARMONY

A unique digital marketing team.

OUR TEAM

PERFORMANCE MARKETING TEAM

SOCIAL MEDIAMARKETING TEAM

BX TEAM

EC CONSULTING TEAM

ACCOUNTMANAGEMENT TEAM

MEMBERS

Meet the Members

MASAHIRO YOKOI

HONG SUNGBAE

SONG JUNGHWAN

DAIKI SHIBA

YUKINO FURUTA

CHINATSU ONODERA

AYUKO KAWAHARA

SARA KIN

AIKA

MASHITAN

AOI HAYAZAKI

KAORI

JI CHENGYU

TANTON NATASHA

YUI

AYANO

MIZUE KAWASAKI

KAZUHIRO YOKOI

CHINATSUSAN

NICKY

PERSONALITY &
HARMONY

PERFORMANCE
MARKETING TEAM

SOCIAL MEDIA
MARKETING TEAM

ACCOUNT
MANAGEMENT TEAM