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Established as an architectural design office.
Initiated the formation of an overseas network for construction drawing production.
Started ordering construction drawings from overseas design offices.
Commenced the construction engineer dispatch business.
No specific events are recorded.
Parent company went public on the Tokyo Stock Exchange JASDAQ.
Moved headquarters to Ikebukuro, Tokyo.
Renamed to Yumeshima Holdings Co., Ltd.
Moved headquarters to Otsuka, Tokyo.
No specific events are recorded.
Launched the recruitment satellite 'Yume Tansaku Cafe'.
Moved headquarters to Marunouchi, Tokyo.
Surpassed 3,000 active engineers.
Surpassed 4,000 active engineers.
Surpassed 5,000 active engineers.
Yumeshima Holdings Co., Ltd. transitioned to a pure holding company structure and established Yumeshima Co., Ltd. through a corporate split.
Yumeshima Holdings Co., Ltd. merged with the former BeNex Group Co., Ltd., and the pure holding company became Yumeshima BeNex Group Co., Ltd.
Headquarters moved to Toranomon, Tokyo.
The pure holding company renamed itself to Open Up Group Inc.
Number of operating engineers exceeded 6,000.
Open Up Group launched the brand website '#WhatMakesaGoodJob' to give employees an opportunity to reflect on what a 'good job' means to them. Through short videos and engineers' career growth stories, the site aims to offer insights to people at work and introduce Open Up to job seekers. The group plans to continue welcoming new colleagues through the site.
On January 1, 2025, Yumeshin received White Company Certification at the Gold level. It was also recognized as a Certified Health and Productivity Management Outstanding Organization for three consecutive years, 2023 through 2025. Its talent development and business model were recognized, and the company now aims for Platinum certification. Yumeshin promotes employee health and works to create an environment where employees can thrive and make the most of their abilities.
Following the merger with Open Up Construction announced on June 20, 2025, Yumeshin Co., Ltd. decided to adopt the new name Open Up Construction Co., Ltd., effective January 1, 2026. The new name brings together the purpose, mission, and aspirations of both companies under one brand for recruitment, training, sales, and on-site operations. The company will continue creating new standards for the construction industry by making integration a source of strength.
On July 1, 2025, Yumeshin Co., Ltd. revised its management philosophy and established its mission, vision, and values (MVV). Executives, managers, and project members held workshops and drafted the new statements to build employee support. The company aims to embed the new MVV throughout the organization and become a company of choice for customers and job seekers. Its management philosophy webpage has also been updated.
Open Up Group Co., Ltd., a shareholder of Yumeshin Co., Ltd., resolved at a board meeting on June 20, 2025, that Yumeshin would absorb and merge with group company Open Up Construction Co., Ltd. Please refer to the attached PDF for details.
Effective July 1, 2025, Kenjiro Ogawa will step down as representative director, and Naoto Takahira will become the new representative director and president. The company intends to continue moving forward under the new leadership.
On January 1, 2025, our company received White Company Certification at the Gold level and aims to achieve Platinum certification. From April 1, 2025, self-directed study will be introduced in continuing training for technical employees in the Tokyo metropolitan area. Trainees can choose from the curriculum to explore their interests and address areas they find challenging. The training takes place after two weeks of onboarding and before assignment, in a dedicated training room with instructors on hand and computers and reference books available.
Effective January 1, 2025, Yumeshin Co., Ltd. received Gold certification under the White Company Certification program administered by the Japan Next Generation Enterprise Promotion Organization. As a first-time applicant, Yumeshin achieved the highest ranking, meeting more than 80% of 70 questions across seven areas, including its business model, flexible work arrangements, and health management. The company sought certification to help people see it as a place where they would like to work. It will continue improving the workplace and building a culture that brings out employees’ full potential.
In his New Year’s greeting, the president thanked everyone for their support over the past year and welcomed the start of 2025. Since amendments to the law in April 2024, the construction industry has been undergoing changes in work practices, with workplace improvement and labor shortages becoming serious challenges. Our company aims to provide high-quality services and improve customer satisfaction by creating a workplace where employees feel secure, expanding matching opportunities and pay increases for technical employees, and improving engagement among office-based employees.
On November 23, with the cooperation of former Japan national soccer team player Tsuyoshi Kitazawa and the Japan Disability Football Federation, the Open Up Group held its third “OPG Purpose Day: Enjoy Walking Football with Kitazawa” for employees across the group. Walking football is played on foot and can be enjoyed by everyone regardless of age, gender, experience, or disability. More than 100 employees, family members, and friends took part, and the event was lively from the opening ceremony through the matches.