Salvation Cocoon, I should have guessed correctly. In short, one of the beginning of the male protagonist mistakenly into the region, see the monster should not see, after two people out (called what blade flag Shi), in short, two dead one, the other female lead amount (want to die are difficult). When he got to the end, he found an egg, and finally the egg came out as a girl who looked like his dead neighbor's sister, so he decided to protect him. As a result, the main character mutates, and the others think he's infected, his hair turns white, and his appearance is similar to those monsters, but the main character is able to use the blade flag, so the organization that observes it (which is actually a monster-infected task force, with a whole bunch of blade flags) locks up the main character to observe him and so on. Inside can through the TV and so on let ordinary human infection, the rest on the owner of their own see it