Onishi Hospital, operated by the medical corporation Keiseikai, is located in Tai, Tamano City, Okayama Prefecture. Founded on the basis of Takahara Clinic, which was established in 1962, this hospital has served the coastal communities of the Seto Inland Sea region for more than half a century. The hospital specializes in internal medicine, and its director holds a doctoral degree from Okayama University's Department of Gastroenterology and Hepatology, with research focused on autoimmune liver diseases. Drawing on experience at a specialized colorectal and proctological hospital, the director is also well-versed in the diagnosis and treatment of lower gastrointestinal conditions such as colorectal polyps and inflammatory bowel disease. The hospital has performed approximately 4,800 colonoscopies and offers safe, minimally uncomfortable endoscopic examinations. Same-day appointment bookings for examinations may be available in some cases. Consultation hours are Monday through Friday from 9:00 AM to 12:00 PM and 4:00 PM to 6:00 PM, with Saturday morning-only hours. The hospital is closed on Sundays, public holidays, year-end and New Year holidays, and the Obon period. It is a designated insurance medical institution operating in accordance with standards set by the Minister of Health, Labour and Welfare, and English-language support is available. The hospital also offers a broad range of home care and rehabilitation services, including day rehabilitation, a visiting nurse station, a helper station, an in-home care support office, and visiting rehabilitation services, providing comprehensive support for elderly residents living in the community. A parking lot is available on-site, making the hospital easily accessible by car.