Ok bois, seems like we've found ourselves on the fluffy part of this website eh?
Looks like this will shape up to be quite the decent romcom.
The MC has an older brother who is the definition of Mr. Perfect apparently. And all the girls he's ever interacted with have always tried to get on dates with MC's brother using him. So it's understandable that he has self confidence issues.
The FMC is the typical, cool, ice-beauty schoolgirl who also happens to be the only girl not using MC to get his brother into a date with her.
Thoughts:
Look like it'll be purely fluff and good vibes, with some sprinkles of self doubt mixed in due to the MC's mentality. Ngl, I'm a big hater of these kinds of MCs but I'm willing to give it a pass just to give this a chance. The story can easily go downhill if the author decides to drag out the "oh she can never like me" plot, which seems to be the glaring issue with most mangas nowadays of this genre. Nevertheless, I do want something other than isekai and villainess slop that we've been getting, so let's see how this plays out.