In a shocking development, it turns out that the equally cheap and tiny room next door to Madge and Ririka's own apartment is occupied by their rival--Aloella-chan, the B-rank witch and popular idol! But before the girls can make any hay out of the situation, Madge finds herself formally challenged to a witch's duel, with her recent memories at stake! She can't chicken out, and she can't lose those precious moments with her partner...So the only way forward is to win! And all this right before the B-rank exam, too...