 If you liked
ef: A Fairy Tale of the Two.
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 ...then you might like
Chikan Otoko
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Both include about love triangles though Ef focuses on several other relationships as well. The settings are a bit different since in Ef the characters are in high school while in Chikan Otoko they go to a university. But in both, the main male character lives alone and is taken care of by the girls he meets, and without them he would be helpless.