 If you liked
Ano Natsu de Matteru
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 ...then you might like
Mikakunin de Shinkoukei
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Something about aliens? This anime is a bit similar to engaged to the unidentified, it has romance but it doesn't have a lot of good laughs. Well I guess it is really similar because of the fact that the main characters suddenly lived under the same roof suddenly, and one of the MC is some sort of alien. I guess I've made my point. Hope that this will help you :)