What are the common plotlines in manga where a skinny girl falls in love with a chubby guy?

Themes often seen are the guy's journey of self-improvement inspired by the girl, and how their relationship defies conventional norms. Sometimes, it's about finding balance between their individual strengths and building a connection based on mutual respect and admiration.

Common themes often include the struggle to overcome societal expectations and judgments. Also, the emotional journey of the characters as they navigate their feelings and the challenges that come with the age gap can be prominent. Sometimes, the story might focus on how the older guy takes on a protective or guiding role for the younger girl.

Well, usually it involves the unpopular guy having some hidden qualities that the popular girl discovers and appreciates.

One common trope is the initial resistance from the rich guy's family. They might not approve of the relationship due to the girl's background.

In many manga, a chubby girl might transform to skinny through a combination of diet and exercise. She could have a strong motivation and determination to change her lifestyle.

Perhaps it tells of their struggle to fit in a society that has certain expectations based on appearance. Or it could simply be a light-hearted tale of their daily lives and the bonds they form.

It might focus on how their differences lead to unexpected partnerships or challenges. Maybe they have to work together to achieve a common goal despite their physical contrasts.

Often, it involves the two characters from different economic backgrounds overcoming societal expectations and finding love. There could also be challenges related to family acceptance and personal growth.

One reason could be a change in diet. Maybe she started to eat more junk food like hamburgers and fries regularly. For example, she used to have a very strict diet of just salads and fruits, but then she got a job at a place near a fast - food joint. She began to stop by there often for convenience. Another reason could be a lack of exercise. If she was previously very active, like going to the gym every day or running, but then due to an injury or just getting lazy, she stopped. This would cause her to gradually gain weight and become chubby.

One such manga could be 'Love Beyond Size'. It shows a guy who is head over heels for a chubby girl, depicting their unique relationship.