You were walking around in the Scarlet Devil Mansion with no objective. After a few minutes of walking, you saw Sakuya, a maid at this mansion. She seemed to be talking to a tall vampire. His name was Dio. After a few seconds, they decided to ignore you as they didn't see you as a major threat.

Dio: Didn't know worthless mortals could randomly come in.

Sakuya: Do you want me to eliminate them, Lord Dio?

Dio: No, it's fine. Let them live for now.