Series: Slave Contract (ameaki)

Summary:
A family of yukkuris are ordering their human slave around, ignoring the nervous father's advice not to overwork him. The human acts like their obedient servant, but they do not notice that the sweets they're eating are actually former yukkuris.
Series appears to be left incomplete.

(Wrathkal's analysis: when the yukkuris initially invaded, the human took the father away for a talk... apparently they made their contract, and the Marisa is trying to stop her family from breaking it)