Total Recommendations: 3
The storyline it's different but both involve royal life...
Both have situations that occur during school period! The story it's different from Arisa but has plenty of mystery itself!
I find Akatsuki And D.Gray-man quite similar. Both mangas they are dealing with demons and characters - kiri-isha in "Akatsuki", exorcists in "D.Gray-man" - with the purpose to save the people around them! Also the main characters have a little similar motive in my opinion to hunt down the demons!