Tensei-saki ga Shoujo Manga no Shirobuta Reijou datta

After learning my engagement had been canceled, I remembered my previous life and realized I was in the same world as my favorite shoujo manga. I discovered I had been reborn as the plump companion of the villainess who relentlessly tormented the heroine. I recalled what was to come—when the villainess was exposed, she would frame me for her crimes, leading to my execution. To avoid this fate, I needed to stop being her follower. Since the villainess only keeps people she considers much uglier beside her, I decided that losing weight might help me escape her grasp. I resolved to start a diet.