 If you liked
Toaru Majutsu no Index
|
 ...then you might like
C³
|
both have many girls
both have kickass women
both the boys have special power
both main characters of the anime have dark past.
both have one tsundere character beside them
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Recommended by TrOjAnHoRsE
Main characters have a similar ability to not be affected by others' powers / curses.
Main female lead are extremely similar in their purpose and abilities as dangerous artifacts.
Villains are similar as members of secretive and powerful organizations.
Ultimately, they are both anime which focus on supernatural powers and the dynamic between the male protagonist and his ever-growing harem of cute girls.