The series was scheduled to launch on Crunchyroll on January 9, but Crunchyroll streamed the first 45-minute English-subtitled episode early on Saturday.
Crunchyroll originally previewed the first dubbed episode at Crunchyroll Expo on September 3 with guests from the anime.
Crunchyroll previously announced plans to debut the dubbed episodes on the same days as the subtitled versions.
The company is producing the dub as its first simultaneous dub title, and it plans to debut dubbed episodes on the same day as the subtitled episodes.