Is instruction in Japanese, English, or a mixture?
Since students speak many other languages besides English, all class instruction is in Japanese. This is a main reason all classes are taught in Japanese—there truly is no other common language. The other, more important reason is that to speak Japanese you must learn to think in Japanese, with its decidedly different grammar structure. The effort of translating back and forth between Japanese and English gains you nothing; in fact, it’s counterproductive.
Many of your classmates might not speak English very well, providing an outstanding opportunity for you to practice your Japanese with them.
Supplementary instruction may take place partly in English if needed. The English support sessions are for U.S. students and are held in English to encourage your good understanding of grammatical explanations.