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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

Plan and execute strategies to keep users engaged and encourage continued use, similar to mobile game operations.
Plan and create in-app notifications for new content additions and event announcements.
Determine which manga titles to add and when, establishing and executing distribution schedules.
Plan sales and events, and create proposals and specifications.
Create and manage monthly and weekly operations schedules.
Create and update in-app data.
Plan and execute initiatives optimized for a learning app, such as daily missions, login bonuses, and limited-time events.
Monitor metrics and plan and execute initiatives to improve KPIs.
Set targets for DAU, retention rates, LTV, etc., and analyze achievement levels.
Analyze user behavior to understand drop-off points and feature usage.
Prioritize initiatives based on data to determine which metrics to focus on.
Design A/B tests to verify initiative effectiveness and analyze results.
Propose and implement next steps based on analysis results.
Manage and oversee projects for new feature development and new product releases.
Create proposals and specifications for new features, such as learning features or UI improvements.
Coordinate tasks and manage progress with engineers and designers.
Establish timelines for the entire product and manage progress.
Visualize project status, report to stakeholders, and coordinate with them.
Identify, analyze, and resolve risks such as development delays and issues.

Requirements

Experience leading development projects and successfully guiding them to release on schedule.
Ability to manage the entire project while coordinating resources and optimizing processes.
Flexible coordination skills and leadership to keep projects moving forward.
Ability to accurately visualize and document project status, progress, and issues.
Ability to establish processes for sharing information among stakeholders.
Ability to identify, analyze, and resolve risks in projects and operations.
Ability to take proactive measures to prevent problems before they occur.
Business-level Japanese and English proficiency sufficient to communicate with internal team members.

Skills

Project Management
Resource Coordination
Process Optimization
Leadership
Visualization
Documentation
Risk Management
Problem-Solving
Proactive Response
Japanese Language Proficiency
English Language Proficiency
Mobile Game Operations
Product Operations
Project Management
Data Analysis
KPI Improvement
User Behavior Analysis
A/B Testing
Mobile Game Planning
Manga App Operations
English Language Service Operations

Location

Tokyo, Japan
Remote

Work Type

Contract to Full-time
Hybrid

Experience Level

Mid-level

Salary/Compensations

¥5,500,000 - ¥7,000,000

Benefits

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

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 way many users think about English learning since its launch in June 2022.
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 you naturally build your English skills while immersing yourself in the stories you love.
Langaku won the Grand Prize in the Self-Improvement category of the “Google Play Best of 2025” awards.
We are focusing our efforts on introducing Langaku into educational settings.
Our product continues to evolve with the goal of creating 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 needs to strengthen its product operations team.