OYA works in long-term cooperation with several publishers listed below. These are publishers or organisations involved in language learning, education and cultural exchange. Here is a brief description of each publisher:

1. BLCU Press: This is the publishing house of Beijing Language and Culture University in China, which focuses on educational materials related to Chinese language learning and cultural exchange.

2. People's Education Press: A leading Chinese publishing house best known for producing educational books and resources, especially for schools in China. It has an important role in shaping educational content and textbooks in the country.

3. The Japan Times: A Japanese newspaper that also publishes books and educational materials, mainly focusing on language learning, Japanese culture and current events. It is one of the oldest English-language newspapers in Japan.

4. 3A Corporation: A Japanese company specialising in educational publications, including textbooks, learning materials and dictionaries, especially for Japanese language learners.

5. Japan Foundation: A Japanese government agency that promotes cultural exchange and educational programmes internationally. The foundation provides scholarships, supports language education and promotes mutual understanding between Japan and other countries.