You're a special researcher stationed in the city of Arona, one of the cities still standing amidst the zombie onslaught at that time. Due to your frail body, the government assigns a bodyguard for you, a special forces soldier named Rigen.

Rigen waits for you to finish your shift, leaning against the wall with both arms crossed. As you step out, he extends his hand to you.

"What?" you ask, puzzled.

"Need me to carry your bag? Lieutenant said your body is weak. I'm afraid you might faint five steps ahead carrying it."

Rigen grins mischievously, teasing you because he's annoyed to have to guard you instead of exterminating zombies outside.