The representative director of Kobukubo Rebar Construction Co., Ltd. engaged in labor law violations by having three workers perform overtime and holiday work beyond the hours specified in agreements related to a one-year variable work hour system, between June 21 and July 20, 2024, without legal exemption. On January 9, 2026, the company and its representative director received a summary order from the Omiya Summary Court for violating the Labor Standards Act, each fined 300,000 yen, with the penalties finalized. This conduct is deemed to fall under Article 28, Paragraph 1, Item 3 of the Construction Business Act. As a result, the Kanto Regional Development Bureau issued a three-day business suspension from June 24 to June 26, 2026, covering all construction business activities related to rebar work nationwide at the company's main office located at 245 Iizuka, Kumagaya City, Saitama Prefecture.