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About the Role

Mantra Inc. is a global AI startup dedicated to eliminating “language barriers” in the entertainment industry, guided by our mission to “deliver manga in the world’s languages.” We envision a future where people everywhere can enjoy the latest manga, anime, and games simultaneously, and engage in conversations that transcend national borders and cultural differences. We believe that the “respect for other cultures” born from a love for these works and interactions among fans will eventually foster mutual understanding around the world. Envisioning such a peaceful and joyful future, we are dedicated to researching AI technology, translating manga, and developing language learning services. We are looking for teammates who share this passion.

Responsibilities

Planning and conducting user research, identifying challenges, and formulating hypotheses
Designing the information architecture and UX flows that form the foundation of product features
Planning product features from scratch (0→1) and translating them into user experiences
Validation and iteration through prototyping
Close collaboration with PMs, engineers, and marketing
Mentoring existing designers and improving the team’s overall design capabilities

Requirements

Experience Design Skills Based on User Understanding: The ability to identify challenges through user interviews and translate them into concrete product experiences
Experience Planning B2C Apps and Games: Experience working on consumer-facing applications or games from the planning stage
Bilingual Communication: Business-level English or higher (as English is the official language within the company), native Japanese speaker

Skills

User research
Information architecture
UX flow design
Product feature planning
Prototyping
Collaboration
Mentoring
Planning
Design

Location

Tokyo

Work Type

Contract
Full-time
Telework available

Experience Level

Mid-level

Salary/Compensations

¥6,000,000 - ¥8,000,000

Benefits

Flexible work hours
Two-day weekend system
National holidays
Year-end and New Year holidays
Annual paid leave
Special leave for family events

About the Company

Mantra Inc. is a global AI startup dedicated to eliminating “language barriers” in the entertainment industry, guided by our mission to “deliver manga in the world’s languages.”
We envision a future where people everywhere can enjoy the latest manga, anime, and games simultaneously, and engage in conversations that transcend national borders and cultural differences.
We believe that the “respect for other cultures” born from a love for these works and interactions among fans will eventually foster mutual understanding around the world.
Envisioning such a peaceful and joyful future, we are dedicated to researching AI technology, translating manga, and developing language learning services.
Langaku has transformed the “conventional wisdom” of English learning for many users.
With the full cooperation of publishers including Shueisha, we offer nationally popular manga as learning materials.
We’re creating a new learning experience that dispels the notion that “studying equals suffering”—one where users naturally acquire English skills while becoming engrossed in the stories they love.
Winning the Grand Prize in the Self-Improvement category of “Google Play Best of 2025” is just one example of these achievements.
We are focusing our efforts on introducing Langaku into educational settings.
Our product continues to evolve as we strive toward a future where everyone can engage with English with excitement—whether in the classroom or at home.
Langaku is currently in a growth phase, and to advance to the next stage as a product, we need to strengthen our design organization.
As our business expands, we are looking to welcome a new designer who can delve deeply into user challenges and take the lead in defining the product’s direction.
We are seeking a designer who can contribute to strategic product decision-making and possesses strong planning skills and strategic thinking.