During summer holidays, Katsuragi reports to the Tsubaratera household to work as a butler in accordance to his grandfather’s will. There, he meets the spoiled and willful Tsubaratera Kotoha.

It is around the fifth century in Europe. Teodora and Helena were daughters of the royal family of Burgund. Burgund had been known as a brave country, but they were defeated by Melven, and Teodora and Helena were captured by them. Melven soldiers raped the captured Burgund women. Because Theodora didn’t want to be raped, she tried to commit suicide. However, when she heard that Helena was also captured, she made up her mind to devote herself to them in order to help her sister.

Yunika is a beautiful girl who spends every day doting on her best friend Risa, a quiet and reserved schoolgirl. Yunika, who has trouble relating to men, hates her best friend’s new boyfriend because she thinks he is manipulating her because he is older than her. One day, Yunika witnesses a shocking and obscene scene involving Risa and her boyfriend, which awakens intense emotions in her.

A special governmental program has been introduced to counteract the declining birth rates of demi-human races suffering due to a lack of male members. Through a so-called “assistance system,” randomly selected humans are required to mate with designated partners—be it elves, sirens, or even dragons.

Iris Thea Eaderlindt, an elven princess known for her open-mindedness and friendly attitude towards humans, is transferred to the Ark Metropolitan Academy. Coincidentally, her new teacher has been selected as her mating partner. Anxious yet determined to fulfill her duty of securing the future of her race, she starts partaking in sexual activities with him. To her surprise, Iris discovers that her partner’s ancestors were orcs, well known for their extraordinary sexual prowess.

As more demi-human students join the class and find out about their teacher’s “side job,” it becomes increasingly difficult for Iris to keep her partner’s attention solely on her.

Maya is a force of nature: wherever she goes, havoc and destruction follows. Men lose control, and become her playthings; while women become so jealous they are led to their doom. Each episode is a tale of a different Maya in a different world.

There is a world where humans and elves live together. Elves rule the world because of their intelligence and longevity. But one day, humans rise in rebellion and a big war breaks out. After a long battle, both countries decide to stop the war by a marriage of convenience. Arsura, a princess of elf country, is chosen as a bride. However, when she is on her way to the human territory, she and Willan, her sister and security guard, are kidnapped by someone! While elves and humans push responsibility to each other, a group of monsters appear! It’s them who kidnapped elf sisters. Their boss is Darsh, who is half human and half elf. What is his purpose…? Another war breaks out now!

Based on the adult manga by Taropun.