Pretty confident this company discriminates against non-Japanese.
Why do you think that? Was the job requisition in English? Did it ask for Japanese proficiency? If the answers are "yes" and "no", respectively, then it's very unlikely they're discriminating against non-Japanese for that job. If they don't want to hire non-Japanese, they'll simply post the job in Japanese only, or put "Japanese language proficiency (N2 or better)" or something like that in the ad. The reality is that not that many companies have an English working environment; this is a country where the national language is Japanese, and not that many people speak English well, after all.
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Why do you think that? Was the job requisition in English? Did it ask for Japanese proficiency? If the answers are "yes" and "no", respectively, then it's very unlikely they're discriminating against non-Japanese for that job. If they don't want to hire non-Japanese, they'll simply post the job in Japanese only, or put "Japanese language proficiency (N2 or better)" or something like that in the ad. The reality is that not that many companies have an English working environment; this is a country where the national language is Japanese, and not that many people speak English well, after all.