Aniplex of America announced at its panel at Crunchyroll Expo 2022 that it would make the English dub of Lord El-Melloi II’s Case Files {Rail Zeppelin} Grace note -Special Episode- available on Crunchyroll, and the dub is available now. It is available in the United States, Canada, Mexico, Brazil, Chile, Peru, Colombia, the United Kingdom, Ireland, Australia and New Zealand.

The story is described as:

A letter is delivered to Lord El-Melloi II informing him of a Clock Tower reunion. One morning, as the reunion’s date draws near, Lord El-Melloi II takes a look in the mirror and reels in shock. He is suddenly a full decade younger. Lord El-Melloi II has become Waver Velvet, his former self. Believing himself to be in the grip of a powerful, magically induced delusion, Lord El-Melloi II immediately begins investigating how this could have happened. On the day of the reunion, he makes his way to the gathering of his contemporaries, planning to confront whoever transformed his body and hoping to reveal their intentions. However, when Touko Aozaki arrives, things take a sudden turn.

Source: Crunchyroll