HPC technology combines carbon fiber tensioning and expansion materials to provide superior strength and toughness, fundamentally eliminating deterioration caused by rebar corrosion. Utilizing seawater and CO₂ adsorbing aggregate, HPC Okinawa can be manufactured with minimal environmental impact, enabling the molding of ultra-thin and lightweight concrete slabs never seen before. HPC Okinawa offers the only precast product that simultaneously achieves high durability, flexible design, and environmental responsiveness through this innovative technology. We will contribute to the construction of sustainable infrastructure in the age of decarbonization.