It was confirmed in the official website of the Black Clover anime series that it will have a total of 51 episodes with four opening and ending themes. This was announced in advanced due to the releases of its DVD and Blu-Ray Box Sets. The first set is slated to be released in Japan on February 23 for 17,000 yen for Blu-Ray and 15,000 yen for DVD.
The other box sets are scheduled to be released on May 25, July 27, October 26, and January 25, 2019. Weekly Shonen Jump will reveal the first edition box set extras on its first 2018 issue.
Black Clover is based from the popular manga series of the same name created by Yuki Tabata. The anime’s first episode premiered in Japan October 3. Viewers outside of Japan can watch the anime series with English subtitles by Crunchyroll or in English dub by Funimation.
Source: Anime News Network