The first promotional video for 9: Ruler's Crown has been released, offering a glimpse into the supernatural school life and mystery that awaits viewers. The trailer highlights the series' core premise: a male protagonist navigating a world where extraordinary powers and time manipulation are at play, hinting at complex relationships and unfolding secrets.

Adapted from the 9-nine- visual novel series by Palette, the anime is produced by PRA. The trailer's visual style suggests a blend of everyday school drama with the fantastical elements characteristic of urban fantasy and superpower genres. With a planned 13-episode run for Summer 2025, the series aims to adapt the intricate narrative of its source material.