This study investigates international double degree programs at Japanese universities, focusing on the experiences of students from developing countries. Through qualitative research involving semi-structured interviews with seven master's-level students from Indonesia, Thailand, and Malaysia, the study explores their motivations, expectations, learning experiences, and cultural challenges. Key motivations for choosing these programs include gaining international experience, enhancing career prospects, experiencing Japanese culture, accessing advanced research facilities, and receiving financial support. Students expect high-quality education and an internationalized campus environment. However, the research reveals a gap between expectations and reality, with many students feeling somewhat isolated from the main Japanese campus community. The study highlights differences in teaching methods between students' home countries and Japan, requiring adaptation to new learning strategies. Language barriers emerge as a significant obstacle to deeper integration and participation in campus life. Cultural adaptation, particularly to Japanese societal norms and communication styles, presents challenges but also opportunities for personal growth. Practical difficulties, such as navigating the Japanese banking system and handling administrative tasks, underscore the need for more robust support policies. Despite these challenges, students find their cultural immersion in Japan to be highly positive and transformative, fostering greater cultural awareness and adaptability. The study concludes with recommendations for Japanese universities to improve international double degree programs, including enhancing language support, promoting cultural integration, improving administrative assistance, and fostering inclusive campus environments. Future research should expand to include perspectives from Japanese students and those from developed countries, as well as investigate long-term impacts on students' careers and personal development. Overall, this research provides valuable insights into the experiences of international students in Japanese double degree programs, emphasizing the importance of comprehensive support systems and inclusive practices in enhancing student experiences and promoting the internationalization of higher education.