We have developed a highly functional soil improvement material (space charcoal) produced by adding soil microorganisms cultivated with our proprietary technology to biochar. This technology improves soil fertility while storing CO2, increasing yields by 10 to 70 compared to chemical fertilizers while using organic fertilizers, and reducing soil preparation time from the usual five years to one month. This technology was achieved by combining several patented technologies, including a method of composing a consortium of soil microorganisms based on the fermentation technology of Japanese sake.