at first he is bro, he stalks and harass mizaki, ie even flipping her skirt to see the underwear in early chapters then "if ur my sister i would be so turned on'' joke of his is actually ermm as well. if these ain't red flags, i don't know what is. he got a wholesome character development in the end yes.
misaki*
It was a different time back then when we were bombarded with sexual harrassments aka "plot development". It felt like most of the mangas coming out was like that
┗( T﹏T )┛
Everyone's out here calling him a red flag and like. If he's a red flag i just feel like you haven't read enough and honestly props to you