Having lost his parents in a car crash, Yuuri is left to live in the mansion on his own. One day, a beautiful maid, Lilith, shows up, offering to work for him for free.

Lilith's former coworker and classmate, Natsume, comes knocking on Yuuri's door, demanding that Lilith comes back.

Yuuri has gotten used to living with Lilith, but he’s still suspicious of her. One day, he spots her leaving the building seeming somewhat anxious.

Tsukasa, a classmate of Yuuri's, is concerned for his well-being after having lost his parents.

Lilith becomes desperate to convince Yuuri that she is not suspicious.

Yuuri finds himself taking care of Lilith for once when she catches a cold.

Christmas is coming, and Yuuri and Natsume plot a surprise party for Lilith.

Tsukasa invites Yuuri over for a discussion about love.

Lilith approaches Fujisaki for advice on how to get Yuuri to open up to her more.

Lilith helps Yuuri prepare for the upcoming sports day events.

A man visits the mansion while Natsume and Yuuri are out running errands.