Source-listed Job

マーケティング責任者/Head of Marketing(Langaku)

会社概要 

Job Source description available
Mantra Tokyo Source published Oct 19, 2026 Source retrieved Oct 19, 2026
Source: Mantra (lever) · A retrieval date records when our system last obtained the source record. It does not guarantee the vacancy is still open or that every detail has been independently checked.
Description from the source The source description is formatted below for discovery. The provider owns the original wording and may change its requirements or close applications.
EmploymentFull-time

Overview

会社概要 

Full job description

会社概要 Mantra株式会社は、「世界の言葉で、マンガを届ける。」というミッションを掲げ、エンターテインメントから「言語の壁」をなくすことに挑戦しているグローバルAIスタートアップです。世界中の誰もが、最新のマンガやアニメ、ゲームを同時に楽しみ、国や文化を超えて語り合う。作品への愛やファン同士の交流から生まれる「異文化への敬意」が、やがて世界の相互理解を育む―。そんな平和で笑顔に満ちた未来を描きながら、私たちはAI技術の研究、マンガ翻訳、そして語学学習サービスの開発に取り組んでいます。 「大好きなマンガの最新作を、世界中のファンとリアルタイムで分かち合える世界」 そんなワクワクする未来を、私たちは創ろうとしています。クリエイターの魂がこもった一コマを、技術の力で「速く」かつ「感情豊かに」世界へ届けるプロセスには、技術的な難易度が高いからこそ味わえる知的な挑戦に溢れています。 自身のスキルを、世界を繋ぐ架け橋に変えたい。エンタメの力で相互理解を深め、より良い社会を築きたい。そんな情熱を分かち合える仲間を、私たちは求めています。 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 “A world where you can share the latest installment of your favorite manga with fans around the globe in real time.” We are striving to create this exciting future. The process of using technology to deliver each panel—imbued with the creator’s soul—to the world “quickly” and “with rich emotion” is filled with intellectual challenges that can only be experienced because of the high technical difficulty involved. We want to turn our skills into a bridge connecting the world. We want to deepen mutual understanding through the power of entertainment and build a better society. We are looking for teammates who share this passion.

「英語が苦手だったけれど、初めて楽しく続けられた」 「Langakuのおかげで、共通テストの模試で満点だった」 2022年6月のリリース以来、Langakuは多くのユーザーの「英語学習の常識」を変えてきました。集英社をはじめとする出版社の全面協力のもと、国民的な人気マンガを教材として提供。「勉強=苦痛」というイメージを払拭し、好きな物語を夢中で追いかけるうちに、自然と英語力が身につく——そんな新しい学習体験を創り出しています。 「Google Play ベスト オブ 2025」自己成長部門 大賞の受賞は、その成果の一つに過ぎません。現在は教育現場への導入も進み、プロダクトは次の成長フェーズに入っています。 一方で、これまでのLangakuはアプリ運営・プロダクトマネジメント・マーケティングを一人が兼務する体制で成長してきました。ここから事業を非連続に伸ばすには、獲得から課金・継続までのファネル全体を一つの数字として捉え、プロダクトとマーケティングを横断して打ち手を設計できる人が必要です。 そこで今回、Langakuのブランド戦略とユーザー獲得をリードするマーケティング責任者を募集します。マンガという強いIPを活かし、広告・ASO・SNS・PR・コンテンツなど複数のチャネルを組み合わせながら、Langakuをより多くの学習者に届けていただきます。獲得数だけでなく、ユーザーがLangakuを好きになり、継続的に利用するまでの体験を、プロダクトチームと連携してつくるポジションです。 このポジションの魅力 事業成長に直結する裁量:グロース領域の戦略・予算配分・優先順位づけを一から設計できるフェーズです。既存の型を引き継ぐのではなく、型そのものを作るポジションです。 プロダクトに手を入れられる:施策の対象が広告だけに閉じません。オンボーディング、課金導線、継続体験など、プロダクトそのものの改善をPdM・エンジニア・デザイナーと組んで進められます 強いIPアセット:国民的マンガという他社が簡単には持てないアセットを、学習体験に変換しているプロダクトです。ユーザーの熱量が高く、クチコミやコミュニティが機能しやすい土壌があります 市場の広がり:toCの英語学習に加え、教育機関向けという第二の柱が立ち上がりつつあります。獲得チャネルの設計余地が大きく残っています。 “I used to struggle with English, but for the first time, I’ve been able to stick with it and actually enjoy it.” “Thanks to Langaku, I scored a perfect score on my Common Test practice exam.” Since its release in June 2022, Langaku has transformed the “conventional wisdom” about English learning for many users. With the full cooperation of publishers such as 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 at “Google Play Best of 2025” is just one of the results of this effort. We’re now expanding into educational settings, and the product is entering its next phase of growth. However, until now, Langaku has grown under a structure where a single person handled app operations, product management, and marketing. To achieve exponential growth from this point forward, we need someone who can view the entire funnel—from acquisition to monetization and retention—as a single metric and design strategies that span both product and marketing. Therefore, we are now seeking a Head of Marketing to lead Langaku’s brand strategy and user acquisition. Leveraging our strong manga IP, you will combine multiple channels—including advertising, ASO, social media, PR, and content—to bring Langaku to a wider audience of learners. This role involves working closely with the product team to create an experience that goes beyond mere user acquisition, ensuring users develop a fondness for Langaku and continue using it over the long term. What Makes This Position Attractive Discretion that directly drives business growth: This is a phase where you can design strategies, budget allocations, and prioritization for growth initiatives from the ground up. Rather than simply inheriting existing frameworks, this is a role where you get to build the framework itself. Opportunity to shape the product: Your initiatives aren’t limited to advertising alone. You’ll work with Product Managers, engineers, and designers to drive improvements to the product itself—including onboarding, monetization pathways, and the overall user experience. Strong IP Assets: This product transforms a nationally beloved manga—an asset that other companies cannot easily replicate—into a learning experience. Users are highly engaged, creating a fertile ground for word-of-mouth and community growth. Expanding Market: In addition to our consumer-facing English learning services, a second pillar targeting educational institutions is taking shape. There is significant room left to design new user acquisition channels.

Langakuのグロース responsible として、ユーザー獲得から収益化までを一貫して担っていただきます。

  1. グロース課題の特定と戦略・戦術設計 ユーザー行動・ファネルデータの分析を通じ、獲得・オンボーディング・利用継続・課金の各段階におけるボトルネックを特定 事業目標から逆算したKPIツリーの設計と、モニタリング体制の構築 分析結果を打ち手の優先順位に翻訳し、投資対効果の高い順に実行計画へ落とし込む
  2. プロダクト改善によるグロース PdM・エンジニア・デザイナーと連携した、オンボーディング改善、課金導線最適化、継続率向上施策の企画・推進 仮説設計からA/Bテスト、効果検証、プロダクトへの実装反映までのサイクルの推進
  3. アプリ内施策・CRM アプリ内キャンペーン、イベント、プッシュ/メール等のCRM施策の企画・実行・効果検証 ユーザーセグメントごとのコミュニケーション設計と、継続・復帰・課金への接続
  4. マーケティング投資の意思決定 CAC・LTV・継続率・課金率を軸とした投資判断 直接的な獲得効率に加え、施策の増分効果(インクリメンタリティ)やブランドリフトも踏まえた、中長期を見据えた予算配分の設計 デジタル広告、ASOなどの獲得チャネル全体の方針策定と、実行のディレクション As Langaku’s Growth Lead, you will be responsible for the entire process from user acquisition to monetization. Identifying Growth Challenges and Designing Strategies and Tactics Identify bottlenecks at each stage—acquisition, onboarding, retention, and monetization—through analysis of user behavior and funnel data. Design a KPI tree based on business objectives and establish a monitoring system. Translate analysis results into prioritized actions and incorporate them into an execution plan, starting with the highest return on investment. Growth Through Product Improvement Collaborate with Product Managers, engineers, and designers to plan and drive initiatives to improve onboarding, optimize monetization pathways, and increase retention rates. Drive the full cycle from hypothesis formulation through A/B testing, effectiveness verification, and implementation into the product. In-App Initiatives and CRM Plan, execute, and evaluate the effectiveness of in-app campaigns, events, and CRM initiatives such as push notifications and emails. Designing communications for each user segment and connecting them to retention, reactivation, and monetization Marketing Investment Decision-Making Making investment decisions based on CAC, LTV, retention rate, and monetization rate Designing medium- to long-term budget allocations that consider not only direct acquisition efficiency but also the incremental effects of initiatives and brand lift Formulating overall strategies for all acquisition channels—including digital advertising and ASO—and directing their execution

toC Web/アプリサービスにおけるグロースまたはマーケティングの実務経験(5年以上目安) KPI設計から予算管理、施策実行、効果測定までを一貫して担当した経験 データに基づく意思決定の経験 ファネル分析やコホート分析を自ら行い、課題仮説を立てて打ち手に落とし込んだ経験 プロダクトサイドと協働した改善経験 PdM・エンジニア・デザイナーと連携し、施策をプロダクトに実装まで持っていった経験 獲得チャネルの運用ディレクション経験 デジタル広告(SNS/リスティング等)、ASO、CRMのいずれかにおける実務経験と、外部パートナーを含めた推進経験 LTV向上に主眼を置いた取り組みの経験 獲得効率だけでなく、継続率・課金率・単価の改善によって事業成長を作った経験 ビジネスレベルの英語力 社内には多国籍のメンバーが在籍しており、英語でのコミュニケーション機会があります マンガカルチャーへの深い愛と理解 自身もマンガが好きであり、ビジネス対象としてだけでなく、ファン心理を深く理解・共感できる方 Practical experience in growth or marketing for B2C web/app services (approximately 5 years or more). Experience taking full responsibility for the entire process—from KPI design to budget management, initiative execution, and performance measurement. Experience in data-driven decision-making. Experience independently conducting funnel and cohort analyses, formulating hypotheses about challenges, and translating them into actionable strategies. Experience collaborating with the product team to drive improvements: Experience working with Product Managers, engineers, and designers to bring initiatives through to product implementation Experience directing the operation of acquisition channels: Practical experience in at least one of the following areas—digital advertising (social media, search ads, etc.), ASO, or CRM—and experience driving initiatives involving external partners Experience with initiatives focused on improving LTV: Experience driving business growth not only through acquisition efficiency but also by improving retention rates, monetization rates, and average revenue per user Business-level English proficiency: Our company has a multinational team, so there are opportunities to communicate in English A deep love and understanding of manga culture: You are a manga enthusiast yourself and can deeply understand and empathize with fan psychology, not just view manga as a business target

以下はいずれも必須ではありませんが、活かしていただける領域です。 統合的なグロース戦略の設計経験 デジタル広告、ASO、SNS、コンテンツマーケティングなどのオンライン施策と、プロダクト内のユーザー体験を接続したグロース戦略を設計した経験 オンライン・オフライン横断のマーケティング経験 PR、OOH、イベント、メディアタイアップ、インフルエンサー施策などを組み合わせた統合的なマーケティング戦略の立案・推進経験 アライアンスによるチャネル開拓の経験 出版社、教育機関、メディア、他社サービスなどとの協業を通じ、新たなユーザー獲得チャネルや事業機会を開拓した経験 外部パートナーのマネジメント経験 広告代理店、制作会社、メディアなどの選定・交渉・ディレクション 親和性の高いドメインでの経験 英語学習・語学サービス、教育/EdTech、ヘルスケア・フィットネス、自己啓発・習慣化系アプリ、マンガ・エンタメアプリなど、サブスクリプション型toCサービスでのグロース経験 While none of the following are mandatory, they are areas where your experience would be valuable. Experience designing integrated growth strategies: Experience designing growth strategies that connect online initiatives—such as digital advertising, ASO, social media, and content marketing—with the in-app user experience Experience in cross-channel marketing (online and offline): Experience planning and executing integrated marketing strategies that combine PR, OOH, events, media partnerships, and influencer campaigns Experience in developing new channels through partnerships: Experience in developing new user acquisition channels and business opportunities through collaborations with publishers, educational institutions, media outlets, and third-party services Experience managing external partners: Experience selecting, negotiating with, and directing advertising agencies, production companies, media outlets, and other external partners Experience in highly relevant domains: Growth experience with subscription-based B2C services in areas such as English learning and language services, education/EdTech, healthcare and fitness, self-improvement and habit-forming apps, and manga and entertainment apps

Mantra Valueへの共感と体現 : TryFirst : 未知の領域でも恐れずに、まずは挑戦してみるマインドを持つ方 Learn and Transform : 成功や失敗から学び、自らを変化・成長させ続けられる姿勢を持つ方 Climb Together : 価値観やバックグラウンドの異なるメンバーを尊重し、前向きに協業できる方 バランスの取れた視点 : 施策によってユーザーを獲得する広告宣伝と、クチコミ起点・ユーザー起点でのPR、両方に目線が向く方 クリエイティブへのこだわり : ユーザーが目にするアウトプット(デザインやブランドイメージ)に対して強いこだわりを持ち、品質を妥協しない方 アイデアと実行力 : 少ないリソース・アセットの中でも、アイデアで壁を越え、自律的に機会を創出できる方 コミュニケーション能力 : 部署や役割を超えてコミュニケーションを取りながら、チーム全体を巻き込んで目的を達成できる方 Langakuへの共感 : Langakuというプロダクトが目指す「好きなことで学ぶ」世界観に強く共感できる方 Empathizing with and Embodying Mantra Value TryFirst**: Someone who isn’t afraid to take on new challenges, even in uncharted territory Learn and Transform**: Someone who learns from both successes and failures and is committed to continuous self-improvement and growth Climb Together**: Someone who respects team members with different values and backgrounds and can collaborate positively A Balanced Perspective: Individuals who focus on both advertising and promotion—which acquire users through targeted campaigns—and PR driven by word-of-mouth and user-generated content Commitment to Creativity: Individuals who are deeply committed to the output users see (such as design and brand image) and never compromise on quality Ideas and Execution: Someone who can overcome obstacles with creative ideas and proactively create opportunities even with limited resources and assets Communication Skills: Someone who can communicate across departments and roles to engage the entire team and achieve goals Alignment with Langaku’s Vision: Someone who strongly resonates with Langaku’s vision of “learning through what you love”

Tips for this job

Practical JobOpportunity guidance. These tips do not replace official rules or create new eligibility requirements.

  1. Tailor the CV and application to the responsibilities and required skills stated on the official employer page.
  2. Use concrete evidence of relevant work, projects and measurable results rather than generic claims.
  3. Confirm location, work authorization, remote restrictions and sponsorship terms before applying.
  4. Apply through the original employer or official recruitment destination shown on this page.
Original authoritative source

JobOpportunity.info helps you discover and organize source listings. Confirm eligibility, dates, salary/funding and application instructions on the original source before submitting anything.

Apply through JobOpportunity →

Browse current JobOpportunity listings from Mantra (lever) →

More ways to save

Discover deals, coupons and free courses on our sister site.

Explore DealVorio
Save more with DealVorio: deals, coupons, free courses, apps and books