Sure is! Frieren has a dedicated fan base thanks to its engaging plot and well-developed characters. The manga has attracted a lot of attention in the comic world.
The opening song was a novel written by Little Red Bean Sandbag. The story was about the protagonist, Su Chen, who had transmigrated to the world of the original god and obtained the "Sound of the Original God" system. He could link to the live music video of the single in the continent of Tivat. Su Chen created a single called " Double Happiness ", which caused a sensation and shock. This song had a suona part, which left a deep impression on people. However, some of the lyrics of the song did not match the customs and traditions of the real world, causing some doubts and confusion. Other than the novel, there were also some related chapters and reviews that could be read.
The theme song might not be the opening song. Although the theme song usually referred to the opening song, sometimes the theme song could be other songs instead of the opening song. Therefore, the theme song and the opening song could be defined and used differently in a work.