 If you liked
Date A Live
|
 ...then you might like
Saijaku Muhai no Bahamut
|
- Both have supernatural and tech aspects
- Both protagonists save heroines from trouble and those heroines fall in love with him afterwards
- Both have an aggressive girl whose eyes have two different colors
- Both protagonists have little sisters who care for them deeply
What's better is Date A Live has a 2nd season so you'll have a nice harem anime that'll satisfy you for awhile.