KDDI is a telecommunications company. Along with its affiliates, Co. operates in four principal business segments: personal, value, business, and global. Co. is engaged in the sale of mobile handset; and the provision of mobile telecommunication services under "au" brand name, Internet contents, settlement service, and electronic money service for individual customers. Co. offers information and communication technology ("ICT") solution services and data center services for domestic corporate customers, overseas companies and individual customers. Co. is also involved in the call center business, the research and technological development, and the telecommunication facilities maintenance.

NTT Data is an information technology ("IT") company mainly engaged in the provision of system integration and network system services. Along with its affiliates, Co. operates in five business segments: public & social infrastructure, financial, enterprise & solutions, North America, and EMEA & LATAM. Co. provides IT services including system integration, network information, consulting, business solution, and system support services to its customers in various industries both domestic and overseas. Co.'s principal products and services are "Accel-Mart," "Aggregate Master®," "Tableau™," "IMDA®," "IsleLinX®," "BRIMOS®," "RemoteOne®," "WinActor," "ANSER," and "AnserDATAPORT®."

Rakuten is mainly engaged in the Internet-related business. Along with its affiliates, Co. operates in two business segments. The Internet Services segment is engaged in the operation of electronic commerce sites, including an Internet shopping mall "Rakuten Ichiba," an online cash back site, a travel booking site, portal sites and digital contents sites; the sale of advertising on Co.'s sites; the provision of messaging and communication services; and the management of a professional baseball team "Tohoku Rakuten Golden Eagles." FinTech segment is engaged in the provision of Internet banking services and online securities trading services, and the credit card and life insurance businesses.