ayanocchi

Shintaro Kisaragi, a HikiNEET who shut himself inside his room for 2 years, had been living his life normally until he met a cyber girl named Ene, who appeared in his computer screen when someone anonymously sent him a mysterious e-mail one year ago. One day, Ene messes with Shintaro's PC which causes him to go outside for the first time in two years.

The heroine, Komori Yui, has always been an ordinary high school student - excluding the fact that as a child, strange, supernatural things happened to her. However, she has always been able to maintain a positive outlook on life.

Yui Komori, still held captive by the Sakamaki brothers—pureblood vampires after her blood—experiences yet more bizarre twists to her life following her stay at their household. Though haunted by enigmatic dreams, Yui soon deciphers their meaning when caught in a car crash, which subsequently leads to meeting four new vampires: the Mukami brothers, Ruki, Azusa, Kou, and Yuuma, who themselves capture the bewildered girl.

In the year 2021, mankind was defeated by Gastrea, a parasitical virus, and is forced to live within a wall made of Varanium Monoliths, a metal that is able to subdue Gastrea. Soon, the "Cursed Children", children born with the Gastrea virus who are able to control it—which gives them superhuman abilities—were discovered.