The male protagonist and the female protagonist's sister had an engagement. The male protagonist was very powerful, but later, the female protagonist's sister died in an accident.

No way! The comic industry is still alive and kicking. There are new comics and creators emerging all the time.

The essential elements of Iron Fist comics typically are the hero's signature iron fist ability, a rich backstory, and a web of relationships that drive the plot. There's usually a balance of action and character development to keep readers engaged.

I don't have a clear idea. It's possible that Jane Doe is the creator of online comic beans, or perhaps just a fan. Without more context, it's difficult to determine the exact relationship.

Nande Koko Sensei Ga manga is in demand in English due to its fresh take on common themes and the way it connects with readers on an emotional level. Also, the art style is quite appealing.

It's got a unique story and charming characters that draw you in.

The appeal lies in its unique blend of creativity and imagination. The comics often have unexpected twists and turns that make them exciting to read. Also, the visual style is very attractive and catches the eye.

The reason might be that the themes explored are very deep and melancholic. Maybe there's a lot of loss or unfulfilled dreams, which contribute to the sadness.

The manga 'Terra Formars' often serves as the basis for its adaptations, but there can be differences in details and presentation.

I'm not really sure. Maybe they share some themes or characters, but it's hard to say for sure without more context.