Kanai Medical Clinic, located on the 2nd floor of Nishi-Shinjuku Prime Square, is an internal medicine clinic conveniently accessible with a 7-minute walk from JR Shinjuku Station West Exit, 3 minutes from JR Sobu Line Okubo Station South Exit, and 2 minutes from Seibu-Shinjuku Station North Exit. The clinic specializes in brain check-ups and was the third in Japan to introduce head MRI and head MRA examinations. The brain check-up is available for 66,000 yen, detecting cerebral infarction, cerebral hemorrhage, and subarachnoid hemorrhage, and is completed in just 3 hours. Comprehensive examination items include medical interview, examination, guidance, blood pressure, vision, body mass index, intraocular pressure, fundus examination, electrocardiogram, urine, and blood tests. The clinic provides general internal medicine, neurology, gastroenterology, and cardiology care. In the anti-aging field, it offers placenta treatment, high-concentration vitamin C IV drips, natural hormone replacement therapy, and NMN IV drips. In addition to brain check-ups, comprehensive health check-ups and optional examinations such as MRI, arteriosclerosis testing, transnasal endoscopy, mammography, and genetic testing are also available. Clinic hours are Monday to Saturday 8:30-11:45 and 13:30-16:45, closed on Sundays, holidays, and summer holidays. English support, credit card payment, electronic payment, parking, and barrier-free access are available.