Slimming Happiness is a full-color hand-painted book, which tells the story of a girl named Jony J. She didn't pay much attention to her appearance since she was a child, but only wanted to enjoy the fun of food until she met someone she liked. After being hit by feelings, she began to pay attention to her appearance, and suddenly found herself unconsciously growing into a bloated meat girl, and began to lose weight in hell for the love of her dreams. After experiencing the pain of unrequited love failure, the hero finally worked out a healthy and scientific slimming plan suitable for himself, found a boy who really loved him, and really began to mature.