Ghost Hunt, Gosick Recommendations
a little scary, arcs span multiple episodes,cases are really mysterious and interesting
They're both about solving multiple mysterious cases. Not just one case throughout the whole series.
gosick and ghost hunt, both are a mystery anime with a hint of romance, the similarity is that gosick closes the novel and ghost hunt does not (in the anime) maybe closed in the manga
Many cases and mysteries to solve. Both MC are smart and calm. Fun to watch. Fast paced.
It's both about solving mysteries, and they both contain a main character who is smart and mysterious.