 If you liked
Ojisan to Marshmallow
|
 ...then you might like
Koi wa Ameagari no You ni
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Two girls (Tachibana and Wakabayashi) with very similar personalities who are in love with an older man (Kondou and Hige) and work in the same place as him. And in both animes, this man does not perceive the feelings of the girl and for a time thinks, that in fact is the opposite.
The difference is that Ojisan to Marshmallow is a short anime and is more focused on comedy.