Located in Yumura, Kofu City, Yamanashi Prefecture, Junsei Clinic is a medical facility that specializes in internal medicine. In 2007, it became the first clinic in Yamanashi Prefecture to establish a Sleep Breathing Center, providing specialized treatment for sleep apnea syndrome with a track record of performing inpatient PSG (polysomnography) examinations. In addition to general internal medicine, the clinic offers rehabilitation services and specialized outpatient services including fever clinics, hyperhidrosis treatment, and smoking cessation clinics. The clinic also treats allergic symptoms caused by hay fever, providing appropriate prescriptions through diagnosis and examination. Health checkups and various vaccinations are available, and supplements certified by the Japan Dementia Prevention Society are also sold. The premises are equipped with parking, are barrier-free, and can provide service in English. Medical consultations are held on weekday mornings and afternoons as well as Saturday mornings, and medical information is provided through the director's blog.