Responses
i have a list, try checking this out
(it's a list of female characters which excells in their field, idk what type of smart you like but i do consider them as smart girlies)
https://www.mangago.me/home/mangalist/2553025/
Tomodachi game
Dr. Stone my beloved
You gotta read a few chapters in to realize he's smart. In the beginning everything appears normal
manga/manwhas/manhuas with really smart main characters? I don’t mind the genre :]