From Star Strings(2011)

Star Strings yori

In Made in Abyss, bestselling creator Akihito Tsukushi took you deep into the earth. Now, in this riveting manga, he recounts the tale of an epic journey into the sky–and far, far beyond. When Kororu, a little girl living alone on a distant planet, finds a mysterious string hanging from the sky, she’s left with just one choice: to climb it. Where does the string lead? And will she survive the journey to the other end?

(Source: Seven Seas Entertainment)

Note: Originally published as a doujin, the title was picked up and released by Takeshobo on September 30, 2017.