Black Clover Gaiden: Quartet Knights  

ブラッククローバー外伝 カルテットナイツ, Black Clover Side Story: Quartet Knights, ブラッククローバー外伝　カルテットナイツ

The story follows Yami Sukehiro, captain of Astas knight order, Black Bulls, who is suddenly aging rapidly. This happens at the same time that an unknown mage attacks the Clover Kingdom. Along with his companions, Asta must overcome new challenges and obstacles on their journey.

Black Clover Gaiden: Quartet Knights is based on the Black Clover: Quartet Knights video game for Playstation 4 and PC.