Trigun Stampede (oc reader)

Centuries ago, eight diamond sisters created and built a sanctuary city kingdom from underground for humans, plants, gems, and all living beings that are saved and brought with from Earth, keeping it secret for protection from the outside of danger that awaits them.

One of the sisters, the pink diamond, Rose, dreams of venturing the outside world, but her sisters refused and are overprotective of the dangers and their little sister from getting hurt or shattered

Then one day, Rose discovered a strange human that was called the Humanoid Typhoon named Vash the Stampede. And with him, there were three more humans as well named Meryl, Roberto, and Wolfwood. Then, she decided to join them as she ventured off to protect her homeland and her people

Now, Rose and her friends will go through many adventures and encounter many friends and enemies, though times had thrown hardships to save all humans and plants alike while falling in love with the Humanoid Typhoon himself.