 If you liked
Ojisan to Marshmallow
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 ...then you might like
Kaguya-sama wa Kokurasetai: Tensai-tachi no Renai Zunousen
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It's not exactly the same, but both are comedies where comics elements are based on the relationship (unconfessed) of the main characters and the misunderstandings about the other feelings.
In Ojisan to Marshmallow, the girl tries to seduce the old man with the only thing he's interest in and, therefore his weakness : marshmallows.
While in Kaguya-sama Love is War, the main characters try to seduce each other, without clearly confessing or showing any weakness.