Norn was at the library researching the King's Vessel that Misia had mentioned. The King's Vessel doesn't have a heat cycle and can freely enter a state of heat, and its semen puts females into a ○○-like heat. Seeing Misia's state of heat, Norn began to think that she herself was a King's Vessel. In this world, the number of males is small, so females work to support their families. Misia was having a hard time with the housework alone, so they decided to hire Chise, Misia's childhood friend, as a maid. Chise, who arrived, had a cute appearance with fox ears, and Norn thought of her as a little sister. Norn gained a sense of satisfaction by having Chise call her "Onii-chan" (big brother). Chise changed her clothes and began cleaning the house. Norn was disappointed that she wasn't wearing a maid outfit, but seeing her underwear from the depths of her skirt, he couldn't suppress his arousal.