Kirikago-hime to Mahoutsukai

Kirikago-hime to Mahoutsukai (霧籠姫と魔法使い, lit. "The wizard & his dear fairy") is a manga series by Chisato Nesumi. It was serialized in ARIA.

Plot
A cranky misanthrope sorcerer, Nebelhaut, reluctantly went into town one day and discovered a fairy that had been injured in a side-show act. With one look at the fairy Nebelhaut decided that she suited him and claims her as part of his collection...