The "Princess" setting introduces a high-fantasy or royal hierarchy dynamic. Narratively, this creates a contrast between a character's high social status, purity, or authority and their eventual loss of control.
The "01" in the search term typically refers to either the original game's release (Version 1.0) or specifically the first episode of the OVA, which often sets the stage for the protagonist's initial hypnotic victories in the royal court. Kyonyuu princess saimin 01
: