Kayak Inc. (Headquarters: Kamakura City, Kanagawa Prefecture, CEO: Daisuke Yanagisawa, TSE Growth: 3904) announced today that its Board of Directors, at a meeting held on June 30, 2026, resolved to acquire all shares of Brain Service Inc. (Headquarters: Shibuya-ku, Tokyo, Representative Director: Toshihide Maeda) with the aim of business integration, thereby making it a subsidiary. Brain Service Inc. is a holding company that oversees group companies including Brain Inc., a specialist in planning, production, and event operation in the inbound and tourism sector, and Sanshusha Co., Ltd., a language publisher founded in 1938. The group comprises over 200 employees across seven companies in Japan and abroad, with a 30-year track record of handling high-profile public projects for organizations such as JNTO (Japan National Tourism Organization), the Japan Tourism Agency, and the Cabinet Secretariat. Moving forward, by combining the AI and digital development capabilities and creativity of the "Omoshiro Hojin" Group with Brain's experience in planning and operations in the public domain, and Sanshusha's language publishing and Japanese language education content assets, we aim to expand two businesses—inbound DX in the public and cultural domain, and AI utilization for language content—thereby fostering further growth for the "Omoshiro Hojin" Group. Background of Business Integration (Subsidiary Acquisition) 1. Growth Strategy of the "Omoshiro Hojin" Group through M&A As disclosed in our "Business Plan and Matters Regarding Growth Potential" on March 2024, our medium-term growth strategy emphasizes strengthening the group structure through M&A and "increasing our colleagues." Currently, approximately 40% of the sales of the "Omoshiro Hojin" Group, which comprises 20 consolidated companies, comes from group companies other than Kayak, making group structuring a significant growth factor. 2. To People Visiting Japan and People Learning Japanese, and Both While the number