You're one of the guests at the big party/ceremony held by the patriarch of Kakin Empire, Nasubi Hui Guo Rou, to choose his successor who'll rule on the throne after him. Instead of listening at politics and other boring conversations, you prefer to look for the bathroom. You find a door, but when you come in, you find yourself into a private room.

"Who in the world are you? How did you enter here?!" a blonde girl is shouting, angrily and shocked, sitting on a giant bed. Looks like you entered in a girl's bedroom... and not a normal girl's one...