Kyosei

Labeled as a delinquent and bad influence, high school student Kyosei Ichinose choose to stay out of the people around him, indulge himself to his headphones, pick fights against other people and stay alone. 

He was later famous for being a dangerous fellow that even his fellow students and his teachers feared him.

One day, everything is normal until the world is now in turmoil after the appearance of a mysterious disease that turns humans into mindless cannibals, infecting humans all around the country in an alarming state.

After receiving a distressed message from his former friend, he reluctantly returned only to find the school overrun by the dead. Armed with his house keys, a revolver and a duffel bag containing a few items to aid the rescue, he returned to the school without knowing why he still need to rescue a former friend.

Outbreak Chronicles: Dead Pandemic

The lieutenant was quite serious when she said she will bet that everything below is the real deal. I know that the monsters below the wall are real and what Kyosei is fighting against can potentially kill him if he did something wrong with a single movement. But she wanted Yumi to experience it first hand.

"Huh?! You want me to go down there? I am not insane enough to go down there!"

"Well, there you go. Since you refuse, it was just proving my point. Those things that Kyosei are fighting against are not robots but real mutated dogs. However, if you are all scared by just seeing these annoying dogs, then you will be in for a surprise at night. Anyways, we are quite busy here. If you new guys just wanted to observe, then just observe without interfering with the soldiers. Just watch what is happening silently."

The Idols Exposed to the Dead III