 If you liked
Sayonara, Itoshi no My Friend
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 ...then you might like
Kocchi Muite Waratte
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Both manga have gorgeous but terribly anti-social/tsundere guys, who are made to become more "normal" by their future partners, both of whom are kind, dorky, and let's face it - a little clueless :p
The art in both manga is good, but Sayonara definitely has superior art.