Premium Agency interview questions

I applied and a few weeks later, I got called about an interivew. I went in and there were two people interviewing me. There were no introductions as to who these people were (no names, no positions). They asked me some questions regarding why I wanted to work for them and wanted to work in Japan. Personally, I bombed because I was BSing more than I should. BUT, the guy ended up grilling me and getting mad at me for doing so horribly. He was yelling at me and even questioned whether I was stupid. Even if I didn't answer the questions beautifully in Japanese, I still tried my best and maintained my composure. I do not think, no matter how bad my answers were, I deserved to be treated like crap.