When converting OPM manga to a web novel, there are several challenges. One is the lack of visual cues in a web novel. In manga, the art helps to set the mood, the time of day, and the location. In a web novel, you have to create these details through words. For example, instead of seeing a dark and gloomy alley in a manga panel, you have to write something like 'The alley was shrouded in darkness, the walls damp and the air thick with an eerie silence.' Another challenge is the character development. In manga, it can be shown through the art and a few lines of dialogue. In a web novel, you need to develop the characters more fully through detailed descriptions and internal monologues.