Become my dog

It was the Edo period.
One night, Horibe Sadatsune encountered a young girl with a mysteriously colored left eye.
Sensing a divine presence from the girl, Horibe unconsciously fell to his knees before her.
The girl, however, showed no surprise and simply told him that they would meet again.

A few days later:
“Serve Princess Mikazuki. Her orders are absolute—regard them as the lord’s own words.”
Horibe Sadatsune received this command from his domain lord.

Obediently, he set out for the mansion where Princess Mikazuki resided—only to discover that it was the very place where he had met that girl.
Realizing that she was none other than Princess Mikazuki, Horibe inadvertently offended her and incurred her anger.

She then asked him, “Were you not told to treat my words as if they were the lord’s?”
When he answered yes, Princess Mikazuki declared:
“Then choose: become my dog, or take your own life.”