After the losing of magical ability to become witches, they once again become them. But, now they have to go through tests from the Witches of the Witch World. They also meet a new member, from New York, U.S. comes Momoko (the yellow Ojamajo). 
(Source: Anime News Network)

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She also speak German and English.

Hana now becomes a peer of the Ojamajo. When Majotourbillon's spirit revives, the witches now have to break her curse. From the help from Pao-chan, Doremi, Hana, and the other witches are able to defeat the curses. 
(Source: Anime News Network)

Na-i-sho is a 13 episode OVA series with episodes taking place during the ~motto~ season. It is a bit more mature than the TV seasons, and looks to develop each of the five witches romantically. Hana is back to a baby, and the mahou shop is a bakery. 
(Source: Anime News Network)

Nini