The crimson loop organization explains that they're protecting the human race from the grey monster. They've been protecting it for thousands and thousands of years, and now they've got a new recruit in the form of a guy named Xiao cheng. He's super excited to be a part of the organization, but he's also a little worried about how he'll be able to protect himself against the grey monsters. He doesn't know how to fight them, and he blames himself for everything that's happened to him.