Beijing Normal University-Hong Kong Baptist University United International College, which is jointly organized with Hong Kong.
At present, there are only three real 2+2 universities in China, but there will soon be a joint venture with new york University, which is under preparation. I don't know which year you took the college entrance examination. Can you catch up with its first year of admission?
At present, there are no 2+2 schools jointly run by Japan in China. If there is, it is also jointly run by the colleges of a university and cannot be called an independent university.
Specifically, you can look at the enrollment brochures of previous years, as well as the websites of official website and the Ministry of Education of various universities.