Tamagawajosui Clinic, located in Kashiwa-cho, Tachikawa City, Tokyo, is an internal medicine clinic staffed by a certified general internist (Doctor of Medicine). Its most notable feature is its focus on evening hours: it is open on Tuesday, Thursday, Saturday, and Sunday evenings (18:30–22:00), providing convenient access for working professionals and busy individuals who find it difficult to visit during the day. The director, Yukimasa Matsuda, holds a Doctor of Medicine degree from the Graduate School of Medicine at the University of Tokyo and is dual-certified as a General Internist by the Japanese Society of Internal Medicine and as a Neurologist by the Japanese Society of Neurology. In addition to general internal medicine, the clinic offers health checkups, vaccinations, and a fever outpatient clinic. An on-site dispensary allows patients to receive prescriptions directly from a pharmacist at checkout. No appointment is needed for most visits (certain vaccinations excepted), making it easy to drop in. The clinic places strong emphasis on infection control through multi-layered measures including air purifiers equipped with ozone, photocatalyst, and HEPA filter technology, regular ventilation, and the use of antimicrobial fixtures. The facility also offers parking, barrier-free access, and electronic payment, ensuring a comfortable and accessible experience for a wide range of patients.