君は冥土様。

A maid turns up at the door of high schooler Hitoyoshi Yokoya, who lives alone, and asks to be hired, though the only thing she is good at is killing. Yuki was raised for nothing but assassination and has never run a household in her life. Hitoyoshi sends her away, then changes his mind after she pulls him clear of an oncoming truck, and she starts fumbling through chores while learning, beside him, what an ordinary day is supposed to look like.