If you liked
Darker than Black: Kuro no Keiyakusha
|
...then you might like
Dimension W
|
They both share the same author (Iwahara Yuuji) and generally gives off the similar vibes. The MCs even attack in a similar fashion of throwing knifes attached to ropes.
If you liked
Toaru Majutsu no Index
|
...then you might like
Rakudai Kishi no Cavalry
|
Both MCs are ranked at the bottom due to the system, but are actually very strong/smart and capable of beating the most OP characters, as we see in the first episodes. Both have at least one supportive female character, who is also strong but not as reliable as the MC.
If you liked
Erementar Gerad
|
...then you might like
Dragon Crisis!
|
Both have male/human protagonists with a female 'friend's (Dragon in Dragon Crisis!, Edel raid in Elemental Gelade) Both have female 'friend's who are able to powerup the male character Both have a certain word/chant they say before powering-up (pardon the crude word) Differences: Elemental Gelade is where the female friend becomes a weapon, and the world is filled with people who can do that, while (for now) only the male protagonist has the ability in Dragon Crisis. Elemental Gelade uses a unique chant where both the human and female has to say in sync, while (for now) both Ryuji and Rose say 'Engage'
If you liked
Kiss x Sis (TV)
|
...then you might like
Yosuga no Sora
|
Brother-Sister incest. Ecchi. Though it seems that Yosuga no Sora will have a more intriguing storyline