Okay so this is a kind of obscure request, but I read Cafe Detective Club and I really love the romance in it. It's between one of the main character's and one of the other main character's brother. The brother seems to like not notice any girls and is completely oblivious to any girl's advances. Then the boy's sister introduces him to her friend and he gets super nervous an stuff and it's super cute. I don't know if I've given you enough, but if you can think of any romances like this I would really like to hear them. Thanks in advance.

See if any of these fit what you're looking for. They all have that aspect of the male MC being cutely infatuated with the girl they love, and are some of my favourite shoujo.
Sekine-kun no Koi
Seishun Kouryakuhon
Akagami no Shirayukihime

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