There are over 100,000 foreign students studying in Japan. If you can speak Japanese, can prove that you have money to fund your education and get excepted to a school it is easy to get a visa. Alternatively, if you can't speak Japanese it may be possible to get a pre-college student visa to study Japanese in Japan.
Most foreign students in Japan are from Asian countries such as Korea, China, Taiwan, Malaysia and Vietnam. There are also a few students from Western countries.
Japan attracts students to college, university and graduate programs. Japanese Universities do a great deal of research and attract top graduate students from around the world.