Located in Shiobe, Kofu City, Yamanashi Prefecture, Mitsui Clinic, Seiseikai Medical Corporation, is a medical facility specializing in artificial dialysis and internal medicine. For 48 years, the clinic has been dedicated to dialysis treatment, leveraging its experience and track record to maintain close medical collaboration with regional general hospitals. With this long history and established partnership system as a foundation, the clinic emphasizes providing comfortable time that matches patients' life rhythms by offering evening dialysis and free shuttle services. In terms of medical care, it provides specialized medical care focused on artificial dialysis and internal medicine, offering flexible service development that responds to patients' requests. Regarding facilities, it has introduced electronic payment systems, provided parking spaces, and established barrier-free accessibility to improve the convenience of hospital visits. It supports English as an available language to meet the needs of diverse patients. The clinic is closed on Sundays. Striving to provide services from the perspective of patients and users, all staff work together as a team to support the improvement of patients' quality of life.