Light and darkness—andthe twelve birthstones...
Will you choose light, or darkness?
At the Twilight Belt between worlds, the twelve birthstones ask you to choose.
Those who serve God.
Enter the Temple →Those who serve the Demon King.
Enter the Castle →Lead the birthstone emissaries
and protect the world.
In the sacred city crowned by the Temple of Light, raise, equip, and awaken twelve emissaries in a character-growth RPG. Express each one through customizable outfits.
Defend the Demon King's Castle
and make it prosper.
On a rocky plateau beneath the red moon, defend the castle from waves of heroes and monsters. Unite the Demon King's forces and develop the castle town.
The birthstones’ story
begins with a choice.
A parcel delivered on a full-moon night.
Twelve colored gems shine as they ask you—
Will you descend as God, or awaken as the Demon King?
“Who must be defeated—
the Demon King, or God?”
Pre-register
Now open
Receive release news and invitations
to early playtests by email.
- Planned for release in 2026
- Early test planned for summer 2026
Characters unlock as pre-registration milestones are reached!
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Our official account @ReBirthstone also shares the latest news.