Momentum and HAKOBUNE to Host Webinar on Failures and Success Factors in Using External Partners

Momentum Inc. (Head office: Minato-ku, Tokyo; President and Representative Director: Kohei Hosoi) will hold a webinar with HAKOBUNE Inc. (Head office: Shinagawa-ku, Tokyo; Representative: Yuki Haruna) on Thursday, May 21, 2026, titled “A Must-See for Agencies: Failure Cases and Keys to Success in Using External Partners: Methods for Moving Beyond ‘Throwing Everything Over the Fence’ and Building Trust.” The webinar will address common problems that arise when advertising agencies begin using external partners, such as operations becoming a black box and unstable ad delivery quality. Based on failure cases often seen in the field, the session will share proper division-of-labor rules for achieving results, the first steps for using external partners, and methods for managing ad delivery quality when working with outside partners. It will also explain how to build an organization that moves beyond simply outsourcing everything and strengthens client trust. The seminar is recommended for managers who want to prevent operational black-boxing caused by full delegation, people who want to improve unstable ad delivery quality caused by overreliance on partners, those who want to break the negative outsourcing cycle in which knowledge does not remain in-house, and those who want to build a strong division-of-labor structure that earns client trust. The webinar will be held online via Zoom. The live session will take place on Thursday, May 21, 2026, from 11:00 to 12:00. Archive sessions will be streamed on Wednesday, May 27, and Thursday, May 28, 2026, from 11:00 to 12:00. The event is hosted by HAKOBUNE Inc. and Momentum Inc. Registration is available at: https://www.m0mentum.co.jp/seminar/260521_seminar. Speakers include Yuki Haruna, Representative of HAKOBUNE Inc. In the financial sector, he has improved CPA while managing advertising operations at a scale of 100 million yen per month, and in the beauty sector, he has generated results through cross-media operations. In a beauty D2C business, he helped grow sales from launch to approximately 30 million yen per month, demonstrating strengths across both strategy design and execution. Ginga Yui from Marketing & PRG at Momentum Inc. will also speak. After graduating from university, he worked in SMB sales at a company supporting new graduate recruitment, then joined a company in the KOKUYO Group. While working in sales for an enterprise BPO business, he also served as a new business project leader and handled marketing duties. After gaining sales experience at Momentum, he now handles marketing and is responsible for activities ranging from new product promotion to marketing. HAKOBUNE Inc. is a marketing company that supports customer acquisition and revenue growth for companies, mainly through web advertising. Its services include advertising operations for Google, Yahoo, Meta and other platforms, as well as MEO measures and LINE Official Account setup. The company has worked on advertising operations across a wide range of industries, including finance, beauty, education, e-commerce, and telecommunications. In addition to ad delivery, it provides numerical analysis and improvement proposals, offering practical support tailored to each company’s challenges. HAKOBUNE also supports partnerships with advertising agencies and sales companies as an operations and delivery partner after ad proposals. URL: https://hakobune-marketing.com/. Momentum Inc. develops and provides comprehensive, high-precision ad verification solutions under its mission of “creating trust infrastructure for the digital society,” promoting a healthier internet advertising environment. These initiatives not only support the long-term development of all stakeholders, but also reduce the cost and workload required to manage risks in digital marketing, creating resources that allow businesses to focus on more fundamental challenges. URL: https://www.m0mentum.co.jp.