 If you liked
Cross Ange: Tenshi to Ryuu no Rondo
|
 ...then you might like
Houseki no Kuni
|
Bunch of characters trying to fought out enemies that mysteriously appear through portals. Story mainly has place in an island without escape. Strong character development of main protagonist. Lot of dialogues between side characters. Both animes are great to watch although Cross Ange is more serious