The effects of Lost Christmas
Lost Christmas is the event that caused mass chaos through Japan, and started the conflict of the series. It started on December 24th 2029.
Background
Everything started when Mana Ouma found the meteorite. She was infected and decided to make her brother, Shu Ouma her Adam. The summer before Lost Christmas, Mana and Shu met and rescued Gai Tsutsugami, and befriended him. But Gai saw that Mana was infected by the Apocalypse Virus and was insane. At the same time, Mana and Shu's father got remarried and their new stepmother wanted them to move to Tokyo.
Event
ON December 24th, 2029 Gai called Shu to a church to tell him of Mana's insanity, but Mana got there first. She gave him a gun, and told him to shoot the star at the top of a christmas tree. He did as he told, but the shoot recoiled and hit him back. Mana simply laughed and used his blood as lipstick. Shu eventually got to the church, to find Gai in a pool of his own blood and Mana. Mana told him to tie the knot, so their genes could repopulate the Earth. But Shu saw part of Mana's hair crystallize, causing him to freak out and call her a monster. Mana in sadness used her new powers to created destruction in the Church. Mana was frighten and ask for Shu help, but he was too scared to help, causing her to unleash all her power. Creating Lost Christmas, but destroying herself.
Aftermath
The event spread the Apocalypse Virus through out Japan. It was so destructive that Japan was nearly destroyed. The UN was forced to intervene, and created GHQ to control the infections. Eventually they found a cure to the disease, but it had to be taken regularly, to stop the infection. GHQ was left in control, but many Japanese dislike their aggressive control, and revolutionary groups like Undertakers were created to regain Japan's independence. Shuichiro Keido and Daath unwilling to let Mana stay dead, created Inori Yuzuriha to act as a vessel for the dead Mana to allow the fourth apocalypse to occur.