The Maid I Hired Recently Is Mysterious, Vol. 3

The maid I hired recently has been causing me all sorts of problems. She won't look afterherself, even when it's rainy or cold. And after receiving a mysterious letter, she says she can no longer work for me! Despite all the trouble, there's no way I'll let her leave-not when I've come to rely on her so much. Besides, how am I supposed to win at the upcoming sports festival without her cheering me on...?