Just as Miyu was about saved from being swallowed into despair, all of a sudden a mysterious small duo that has mastered the Class Cards suddenly appears in front of the Illya? These witches are taking things to the next level! (Baka-Updates)

Continues right after 2wei ended, where Miyu is captured to another world.

The name is a word play on “3” and “Drei”, which is German for “three”.