Located in Koga City, Fukuoka Prefecture, Mai-no-Sato Naika Clinic, operated by Medical Corporation Yurino-kai, is a medical facility specializing in internal medicine with multiple board-certified specialists on staff. The clinic offers gastroscopy examinations performed by a Japanese Society of Gastrointestinal Endoscopy-certified specialist using ultra-thin transnasal endoscopes approximately half the diameter of conventional models, ensuring minimal patient discomfort. An ozone washing and disinfection system is employed, with examinations typically completed in about 10 minutes, followed by approximately one hour of bed rest before results are explained. In addition to these advanced facilities, the clinic has a Japanese Respiratory Society-certified respiratory specialist on staff, providing treatment for respiratory and allergic conditions. Clinical services include shingles vaccination as well as garlic and vitamin drip infusions. Itemized statements are provided free of charge, and when generic medications are available, prescriptions are written using generic names, reflecting the clinic's commitment to patient education. The facility is equipped with parking and barrier-free access, and English-language services are available. Hours are 9:00 AM to 6:00 PM on weekdays and 9:00 AM to 1:00 PM on Saturdays, with closures on Sundays, holidays, New Year's, and Obon periods.