This is quite subtle fan service.
Any art image you find from Megami Magazine or Nyantype Magazine, be sure to add them there, too. Sonata, I added some of pics such as Queen Blade to those galleries.
This is from Nyantype #41.
She's a former slave who ran away with her older sister. Maoyuu's head maid take her and her older sister to become maids.
There is seemingly no 'perfect' way to truly say goodbye. So I gathered a bunch of them!
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