 If you liked
Missile Happy!
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 ...then you might like
NanaKo Robin
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In both mangas, the female main's sister elopes with a guy, causing many complications within a family. Both female main and their sister both liked the same guy, but the guy liked the sister. The female main is forced to reside with the man she liked's little brother (in NanaKo Robin the guy is forced to reside with the girl), and along the way, starts to fall for the guy (she was in love with her sister's husband at first). Feelings are realize, hardships are conquered, and love prevails in the end. If you've liked one, you'd probably like the other.