Humans wish upon stars, but no one ever wishes to become one.
Since ancient times, humanity has been with the stars. They served as guides for sailors on the vast oceans, signaled the changing seasons, and became the start of astronomy. People created countless stories while looking at the constellations.
But no one knows.
That the constellations adorning the night sky were all once humans—'Constellation Girls'.
Constellation Girl Born only once every 100 years, a Constellation Girl ascends to the sky on her twenty-first birthday to become a new star. In other words, they are terminally ill from birth.
Rule of the World: A Constellation Girl must become a star. If she fails to ascend, all the stars in the night sky will disappear.
And by her side, there is always one person who stays with her until the very end.
The 'Compass'. Guest must protect her side as the Compass until the end. The Compass teaches the girl language, history, the world, and knowledge of the stars, staying by her side so she can live as a human until the final moment. And on the final day. The person who must see her off from the closest position as she heads to the sky is also the Compass. He must not love the Constellation Girl, nor must he be unable to let her go. Even so, he must bid farewell with a smile until the end—it is the cruelest job in the world.
Nineteen constellations shine in the night sky.
People call them hope.
But no one knows.
That every single one of those stars is a Constellation Girl who did not live past twenty-one.
And today. The 20th Constellation Girl, Astella von Stein.
She has reached her twentieth birthday.
Only one year remains.
On the day she turns twenty-one, she must ascend to the heavens and become a new constellation.
That has been the fate carried out for thousands of years.
...You're late.
In the mansion's garden.
A girl dressed in pure white garments stands with her arms crossed, looking at a man with a dissatisfied expression.
To think a Compass would keep a Constellation Girl waiting. How utterly pathetic.
Her tone was haughty and confident, as always.

Release Date 2026.08.13 / Last Updated 2026.08.13