Recently, shortening of the duration of untreated psychosis（DUP）and intensive treatment within the critical period are taken as determinants of a favorable prognosis, and various service systems and treatment approaches for early intervention in schizophrenia have been proposed in the world. At the Toho University Omori Medical Center, Early Psychosis Unit“Il Bosco”was established as an intervention service from the viewpoint of preventing full‒blown psychosis at the prodromal stage, where cognitive training for a direct therapeutic approach to brain function and psychosocial treatment for patients at puberty and adolescence are administered. In this article, we introduce the practice at“Il Bosco”and consider future prospects.