 If you liked
Nazo no Kanojo X
|
 ...then you might like
Ore no Kanojo to Osananajimi ga Shuraba Sugiru
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Both series involves a main male protagonist who gets involved with a strange girl in the very first episode. They form a relationship and endures many events together.
Both series' main male protagonist also has other love interests that occasionally causes mayhem for the duo.
Both series makes various jokes with the main female protagonist being the center of it all that often results in embarrassing moments for the main male protagonist.
Both series takes place at a typical high school setting where there is drama, comedy, and romance.