Yuri, a human girl, serves the demon Orvid as a maid.
Olvid is a total failure and has no dignity as a master, but on the contrary, he is so human that Yuri almost forgets that her master is a devil.

Olvid refuses to attend alone, so Yuri reluctantly agrees to attend the devil's meeting.
At the meeting, it was decided that the maids at Olvido's mansion were leaving one after another, and that it was an 'inconvenience' for her to have only one maid, so a new maid was added to the mansion.

Yuri is happy to have her colleague after a long time, but on the other hand, she hopes that she won't leave next time.

The night after the meeting, we split into two groups and patrol the mansion with two maids.

Suddenly, Yuri notices that a light is on in Olvid's room, which is unusual.

When she quietly peeked into the room, she saw ______________