Ultra Maniac OVA

Synopsis:

Magic and spells are superstitious and silly -- or at least, that's what Ayu used to think. The popular high schooler's life used to be filled with classwork and daydreams of Kaji, until Nina became involved in her life! Hailing from the Magic Kingdom, the witch apprentice is eager to help Ayu through any situation, including the inevitable loss of a tennis match against a rival she can't defeat: a boy! Luckily, to help her win, Nina devises a spell to turn her into something more appropriate: a male?! With time running out, can Ayu win the match and Kaji, even though she's no longer a she?