 If you liked
Masou Gakuen HxH
|
 ...then you might like
Darling in the FranXX
|
While one is an romance and other is an harem/ecchi, both still have some things in common
-In both they live in some kind of apocaliptic world, where the main characters have to fight against multiple enemies.
-In both the protagonist is weak and useless in the beginning, but he is shown to be necessary due to some kind of unique hability he has
-In both there is a connection between male and female characters (although in HXH the only male character is the protagonist), and the way this connection is made is very erotic