 If you liked
Onegai☆Teacher
|
 ...then you might like
Rec
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If you're looking for some short comedy and romance, then these two series are the way to go especially when a boy and a girl living under the same roof is one of the themes of both series.
Additionally, there are those awkward moments and sexual tension between the main characters that you can cut through with a knife.
Great series for fans for those looking for romance (with a little ecchi and mature themes) ;)