Mana Ouma is Shu's older sister, and is the first to get infected by the Apocalypse Virus.
Mana Ouma is Shu Ouma's older sister. She was a very loving and caring older sister, whom Shu loved dearly.
Mana happened to be the first to touch "the rock that started it all", which is the meteor that brought the Apocalypse Virus into Japan. Being the first to touch it, Mana was the first victim of the Apocalypse Virus.
After being infected by the virus, Mana began to display peculiar behaviour. Gai, who was saved by Mana and given the name "Triton" by her, tells her that the Apocalypse Virus slowly drives people insane. Surely, the Apocalypse Virus slowly began to change Mana into somebody she is not. Mana later begins to show affection and desire for her little brother, Shu.
Mana attempts to undergo a ritual with Shu, where they both get married and infect the entire world with the Apocalypse Virus - killing them. Shu, frightened by his sister calls her a monster. This devastates Mana, who ends up getting destroyed by the power of the Apocalypse Virus due to her despair. Her outburst was what caused the Lost Christmas event.
The original character art for Mana Ouma was created by Redjuice Graphics.
Mana has fair skin, and long light pink hair. She wears a white flower on the left side of her head.
Since Mana was the first to touch "the rock that started it all" and thus the first to get infected by the Apocalypse Virus, she has the ability to initiate and create an explosive widespread of the Apocalypse Virus, crystallizing people in an instant and shattering them. She was the cause of "The Lost Christmas" event.