It's called The Last Three
It has 5 chapters
The summary is
Octavia, Liam, and Scarlet are the last humans on earth, and they are stuck in a bunker due to toxins in the air. Liam finds a mysterious hidden room in their bunker, and they explore and accidentally get sucked up into a portal to a different plant. Octavia, the protagonist of the story, and her friends embark on an adventure across space.
The link is https://www.penana.com/story/148584/the-last-three
It has 5 chapters
The summary is
Octavia, Liam, and Scarlet are the last humans on earth, and they are stuck in a bunker due to toxins in the air. Liam finds a mysterious hidden room in their bunker, and they explore and accidentally get sucked up into a portal to a different plant. Octavia, the protagonist of the story, and her friends embark on an adventure across space.
The link is https://www.penana.com/story/148584/the-last-three
It is ongoing, planning on 30 chapters