No.1 Co.,Ltd engages in the planning, development, manufacture, sale, and maintenance of information security equipment and OA related products in Japan. It offers multifunction printers, business phones, and file servers. It also engages in the sale and maintenance of information and communication equipment; wifi devices; develops, manufactures, and sells OEM/ODM supplies; electricity; information security and office equipment; IT engineering; semiconductor; system designs; energy products; call centers; printers; provides network infrastructure, data centers, ICT support services; and application services. The company was incorporated in 1989 and is headquartered in Tokyo, Japan.