Manga by author Sakura Ageha

Agnes, who was ridiculed in the social circles for being an unfashionable noble, happened to help Nazelbert, the duke's son, who had been betrothed to the Princess.However, the Princess saw this and ordered Nazelbert to marry Agnes as punishment.Isn't it terrible to marry me as a punishment? Look, he seems to hate it too. Wait, he doesn't?This is a story about an unfashionable noble and a duke's son, who grow closer to each other.---* (https://ncode.syosetu.com/n2047go/)

I recalled memories of my past life after Grandfather told me my engagement was broken. At the same time, I realized this world was the same world as in my favorite shoujo manga. The villainess who exhausted every method possible to bully the heroine I reincarnated as that villainess' chubby follower. I shook upon remembering the future lined up for her. When the villainess' evil deeds came to light, she pinned all her crimes on Britney. I was a character that gets executed.To reliably avoid this, I must not become the villainess' follower. As this villainess only keeps those who are exceptionally uglier than her by her side, I may be able to do something if I slim up. For now, let's go on a diet!---* (https://ncode.syosetu.com/n4774dz/)