 If you liked
Suzumiya Haruhi no Yuuutsu
|
 ...then you might like
Toaru Majutsu no Index
|
- sci-fi
- both deal with the supernatural
- cast from both series is very similar (character personalities)
- male protagonist that somehow gets involved
I watched Toaru no Index before Haruhi no Yuutsu.
When I was watching Haruhi, during some moments it felt like I was rewatching Toaru no Index.
They are extremely similar, but also have many differences.
If you like one, I strongly suggest you try the other.