All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
It is known that the Japanese are neither Muslims nor from the People of the Book. So, the meat of any animal they slaughter is forbidden for Muslims regardless of how the Japanese slaughter their animals.
So, the Japanese kitchen contains some of this meat or some pork. It is unlawful for a Muslim to work in such kitchens. In fact, the Muslim should oppose all Munkar (bad deeds) with all his strength. Allah Says (what means): {And it has already come down to you in the Book that when you hear the verses of Allah [recited], they are denied [by them] and ridiculed; so do not sit with them until they enter into another conversation. Indeed, you would then be like them.} [Quran 4:140]
So, the Muslim should not sit with non-Muslims while they are practicing their evil acts as this might cause him to become so used to these acts that they make him indifferent while he should be very upset and angry when he sees a Munkar being practiced. This might even lead him to commit such sins.
For more benefit on the prohibition of alcohol in Islam, please refer to Fataawa 81900, 81389, and 81461.
Allah knows best.