So, the girl who did the least and the one who always wanted to be different from the sisters, spends all these years trying to be unique and the only thing she can do is to be helped by the sisters to get married. 0 character development ... More cliché than that impossible.

Meanwhile, the character who had the same challenges as the MC, not being able to be good in studies and struggling to improve, is also the one who had 0 development throughout the series, but manages to overcome this difficulty and become a teacher, which it seems is the least deserved to marry the MC.

As Nino said in the school cafeteria: It must be easy to be Yotsuba. Always winning something without much effort.