Ryuukyuu Timeline: Mirai Shoujo to Inishie no Ou
English name: Ryukyu Timeline: The Girl from Future and the Ancient King
Genres: Fantasy
Type: ONA, Episodes: 1
Aired: Mar 8, 2021
Studio: Gyorai Eizo Inc.
Source: Other
Rating: G - All Ages
Synopsis:
A historical fantasy that unfolds a mysterious story between a high-school girl from Urasoe and Satto, the king of the Ryukyu Kingdom.

(Source: AniDB)