first interview in japanese talking about non-tech related stuff, sadly didn't pass to the next stage. From their description, there are 2 interviews we need to pass before getting an offer from the company

Applied through a recruiter. We practised interview questions beforehand. The interview was quite pleasant and relaxed. The interviewer said that my Japanese was good, and we were able to have a good conversation. Although I was then rejected with my Japanese being the reason why. That was very disappointing and confusing.