 If you liked
World Trigger
|
 ...then you might like
Houseki no Kuni
|
If you're looking for some sci-fi, then Houseki no Kuni and World Trigger will definitely inspire you with some of its imaginatively. Both series includes a theme of invasion from outside forces. And from that invasion, there is battles and wars that are fought. Both series has fantasy elements as well as bits of mystery especially in regards with the invaders.