The interview for the English Immersive is in English only, and the interview for the Japanese is in Japanese only.
The technical check-in for the English Immersive/ Immersive Part-time is in English only, and the technical interview for the Japanese is in Japanese only.
For the English immersive, there is no test for Japanese language skills.
For the Japanese course, there is an English reading test since some English skills are required to read some English documents.