why did eren start the rumbling

Yes, Eren did die in the manga.

Yes, he did. His death was a significant event in the manga's storyline.

In a post - apocalyptic fictional story, there could be a group of survivors who get stomach rumbling and diarrhea after eating some contaminated food they found. This would be a big problem as they are already in a difficult situation. Some of them might think it's a new virus or something, while others would be more concerned about finding clean water and proper medicine. It would create a lot of internal conflict within the group and also make them more vulnerable to outside threats.

Well, in a fictional adventure story, a traveler in a strange land could get stomach rumbling and diarrhea from eating an unknown fruit. This would then lead to a series of events like seeking help from the local tribes, who may or may not be friendly, and it could be a turning point in the story, either making new allies or facing new enemies.

In the manga, there was no scene where Eren and Mikasa kissed. The relationship between them was complex but didn't involve a kiss.

Eren died in a complex and intense battle. His death was a result of multiple factors and the decisions he made throughout the story.

Eren's death in the manga was a powerful moment. It was brought about by a combination of his own decisions, the opposition he faced, and the overall plot developments. It left a lasting impression on readers.

Yes, Gabi did shoot Eren in the manga.

Eren died in a rather complex and dramatic way. He was ultimately defeated in a final confrontation with his former allies.

I'm not entirely sure as I haven't read it in detail. But generally, a visual novel often involves a story with characters, plot twists, and multiple endings. 'Rumbling Heart' might be about relationships, emotions, or personal growth of the characters in the story.