The tweet about Ys Memoire: The Oath in Felghana was mistakenly posted on June 30, 2024, and was promptly deleted4. It was intended to be posted on July 7, the last day of Anime Expo 2024. The tweet revealed that Ys Memoire would be available for demos at the event, alongside Potionomics: Masterwork Edition and Corpse Party II: Darkness Distortion.
Ys Memoire: The Oath in Felghana is available on PlayStation 5, PlayStation 4, and Nintendo Switch in Japan.
The revealing tweet by XSEED Games was deleted after it was accidentally posted ahead of the intended announcement date, which was supposed to be on July 7, the last day of Anime Expo 2024.