The social burden caused by mental illnesses has been highlighted worldwide, and the implementation of strategy for prevention of and recovery from them is an urgent problem. At the beginning, the main target of psychiatric early intervention was psychotic disorders, such as schizophrenia. Recently, the scope of intervention has been including not only mental illnesses but mental health problems. Although assessments based on the clinical staging model, which is a framework for understanding illness trajectory from mental health to mental illness, is needed for young people who are help-seeking and are common age for the onset of mental illnesses, it has been examined only in medical facilities in Japan. It is quite difficult for young people to access medical facilities directly, thus many of them do not receive necessary support based on appropriate assessments. As a solution to this situation, the usage of the "integrated one-stop care" has been proposed by the World Health Organization and some leading countries. Based on these evidences, we started a new trial of an integrated one-stop mental health service for young people in Japan, SODA (Support with One-stop care on Demand for Adolescents and young adults in Adachi), at Kita-Senju, Tokyo, which is a metropolitan area where many young people concentrate. The SODA is an independent counter from medical facilities and provides early support assessments by a multidisciplinary team on demand for young people. In addition, it aims to achieve the one-stop care in community thorough a construction of comprehensive support systems by the method of clinical case management. In this report, we investigated a data set from SODA. Many of young people who sought help to SODA had mental health problems with multiple psychosocial difficulties, such as social isolation and unemployment. Only about 30% of them had visited medical facilities regularly. After the first consultation at SODA, about 70% of them took a psychosocial support session at SODA. In addition, we cooperated continuously with medical facilities and other organizations to construct of comprehensive support system. Social implementation of early consultation and support systems in the community is a trend in developed countries, and it leads to improving outcomes of mental illnesses and even preventing them. For the development of "the community-based integrated care system adapted for individuals with psychiatric disorders" in Japan, the early consultation system is thought to contribute to lightening the social burden and sustainability of this care system.
 Authors' abstract