 If you liked
Mahou Shoujo Lyrical Nanoha
|
 ...then you might like
Momo Kyun Sword
|
Magical girl series whose crystal collecting main plot focuses more on the motivation of the antagonists than why the protagonists are trying to stop them. Fate and Onihime both have similar issues trying to gain the approval of their sole parent.
Both contain quite a bit of fanservice, albeit Momo Kyun Sword is ecchi-centric whereas Lyrical Nanoha doesn't dwell on it.