バリーゾールの子供は一人っ子 (Bariizooru no Kodomo wa Hitorikko)

Background
Note: Until there is an official translation for "Bariizooru", the romanization will be used in the title

A son of Barisol is born a signle child and is the only heir to the rich household. While everyone envies he's beautiful looks, he is always shunned becuase of his cross dressing.

A daughter of Rahab Barisol is born a single child and is branded as a "Once in a millienia child prodigy" and enters college at the age of six. She becomes puzzled with how people can be so hateful that they can kill. After some research she finds a type of infection dubbed "malice", that came from a parallel world.

In his adulthood, Barisol's son starts dating a maid that works at his family mantion. However when he tells her that he wants to wear her dress, she becomes repulsed and calls him disgusting.

In her adulthood Rahab Barisol's daughter becomes infected with "Malice" and gets murderous impulses. Wanting to stop before she commits a serious crime, she consult a researcher of prallel unverses and he tells that she can kill herself from another world adn that should remove the malice for good.

Heartbroken by his girlfreind's digust with him, Barisol's son dismembers her and steals her clothing. While some tries to get into his room he sees a girl that looks like him in the mirror and she stretches out her hand to him. After getting dragged into the parallel world, she takes him with her on the ark that will travel in search of a new world. Barisol's daughter was originaly planning to kill him to save herself from "Malice", but realized that the researcher was trying to trick her into becoming fully infected and she wouldn't have been allowed to come with the people on the ark.

Proclaiming themselves twins, Levia and Behemo Barisol sail across the universe in search for a new paradise along with the other gods and with their combined knowledge of how people work, they will eventually create the kind known as "Humans".

This song is part of the Original Sin Story and was released on the Original Sin Story -Complete Edition- album.