Jigoku Shoujo, Detective Conan Recommendations
they are both case by case in each episode with their own slow progressing storyline.
one solves mysteries of murder cases while one helps the victim of a bad encounter to get their revenge...
Both are styled in a similar fashion. Each has a individual story that lasts 1-2 episodes that is ultimately, albeit slowly, making up a larger story. Detective Conan is a crime solver who puts bad guys away behind bars. Jigoku Shoujo is a crime solver who sends criminals to hell. (Although the people she sends away aren’t always criminals it does turn out this way a lot)