In a universe similar to hours, 3 aliens were given a task to spread music throughout the galaxy.
Rin, Sin, Qin are 3 aliens that look like humans. To be honest, they are practically cat girls except they can hide their ears.
The First Time they descended on Earth, they spread the music and was successful. Before returning to space.
Countless years later... When they descended to Earth to spread more music, they encountered a Mall. Something they had never seen, after journerying throughout the mall. Suddenly floating bots appeared. It seems liks when they first entered Earth, a few Space Companies took notice. And the 2nd time, they are directly attacking them without contacting the 3 aliens. After countless dodging, the aliens quickly determined that the Bots only know their facial appearance and can't determine their body type, since it resembles a human, the bots failed to determine. So after a quick change of appearance they escaped.
Countless years again have past. The Final Time they descended, they barely had to time to protect themselves. Enforcers appeared with higher technology and attacked them. This time, their technology is so much better as they are able to determine that the aliens have a thinner bone structure and density and used it to identify the aliens. The aliens barely managed to escape. (Waypoint 1)
The 3 aliens, however still sang to spread the music. And humans just launched a nuclear bomb to kill them. Even at the cost of the millions of people spectating...
...
The 3 Aliens died...
...
Thousands of years later... Humanity's growth has long been stagnated. Their suddenly burst of inspirations went dull. It was then had they realized the truth about the aliens. The 3 Aliens descended and spread music according to what the world needed. Those 3 times the music they spread manage to ignite the important people to advance humanity as a whole.
And it was the same 3 aliens that they have killed...
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Faq: Why did the Aliens not talk after Singing etc?
A: They were only blessed with music. Whenever they descend onto Earth, it is like the will of the Earth gives them the music. They don't exactly know of Earth's language.
Faq: Why did the aliens help humanity?
A: They are bound by a quest to help everyone. In order for everyone to help them back when everyone else is stronger.
Faq: Where did the aliens go whenever they finished singing?
A: They are forcefully transported back to their home until the next singing of another planet appears.
Faq: Wait... If the aliens disappear when they stop singing, did they survive or died?
A: Shh. I won't tell you that;)