"Học Tiếng Nhật Online" is a free application designed for learning Japanese online and engaging in conversations with native speakers. The main character of the story is Anna, a 20-year-old student from Thailand, who has a deep passion for Japanese manga. She travels to Japan to study Japanese for a year at a university in Tokyo. Anna will practice Japanese through various experiences, including classroom lessons, daily dorm life, shopping, and sightseeing.

The app offers concise lessons to keep learning engaging and not overwhelming. With lessons at various levels, even beginners with no prior knowledge of Japanese can start from scratch and progressively improve their skills. It is also suitable for those looking to enhance their listening and speaking abilities in Japanese.